A good water treatment tank is the backbone of any water purification setup. Without somewhere to store and process your water, even the best filtration system can’t do its job properly.
We’ve come a long way from the old days of letting particles settle in a pot and hoping for the best. Modern water treatment tanks are purpose-built for specific tasks — whether that’s holding RO-purified water, regenerating softener resin, or maintaining steady well pressure.
Here are 10 of the best water treatment tanks available, each designed for a different role in the treatment process.
Water treatment tanks come in many types, each designed for a specific purpose. Choose based on your actual water treatment needs -- whether that's storing purified RO water, softening hard water, maintaining well pressure, or treating wastewater.
Quick Comparison Chart
| # | Water Treatment Tank | Our Rating | ||
|---|---|---|---|---|
| 1 |  |
iSpring RO Tank | ★★★★★ | Check Price |
| 2 |  |
Brine Tank Softener | ★★★★★ | Check Price |
| 3 |  |
Well Pressure Tank | ★★★★☆ | Check Price |
| 4 |  |
RV Holding Tank | ★★★★☆ | Check Price |
| 5 |  |
Solution Tank | ★★★★☆ | Check Price |
| 6 |  |
Septic Tank | ★★★★☆ | Check Price |
| 7 |  |
UV Treatment System | ★★★★☆ | Check Price |
| 8 |  |
Receiving Tank | ★★★★ | Check Price |
| 9 |  |
Aeration Tank | ★★★★ | Check Price |
| 10 |  |
Expansion Tank | ★★★★ | Check Price |
1. iSpring RO Tank — Best Overall
iSpring Reverse Osmosis Water Tank
This RO storage tank stores purified water under pressure for on-demand access. It fits under the sink, produces sodium-free water, and requires no booster pumps thanks to its built-in pressure mechanism.
Pros
- Built-in pressure mechanism eliminates need for booster pumps
- Fits neatly under the kitchen sink
- Produces completely sodium-free water
- Easy access to clean water on demand
- Energy-saving design with no heating required
Cons
- Tank pressure may decrease over time
- Limited storage capacity
- Requires compatible RO system
For those who want to cut costs, these reverse osmosis water tanks are highly recommended.
Reverse osmosis entails the movement of water molecules from an area of high particle concentration (contaminated water) to an area of lower particle concentration (almost pure water).
These tanks complement the reverse osmosis system.
Water treatment occurs by passing it through a semipermeable membrane in the form of droplets.
It may be tedious to fill a glass from the reverse osmosis system because it comes out in droplets.
Therefore, the reverse osmosis tanks come in handy as it stores the water for you until you need it.
There are two parts of water treatment, that’s, a part containing water and one with air providing the pressure required to pump the water out, and they constitute the tank.
These water treatment tanks control the turning on and off of the reverse osmosis system through a valve.
The tanks come with an inner lining called butyl, which separates the pure water from the steel.
The reverse osmosis tanks produce very tasty water as a result.
You don’t have to worry about any chemical addition when using this tank.
This tank is best suited for water filtration in homes that are facing an issue of inorganic contaminants in their tap water.
The tanks require a pressure of about 35psi (this stands for the pounds of force per square inch) when full.
By putting in place another storage tanks, the reverse osmosis tank’s water capacity may be increased.
The tanks may lose their pressure over time, but using a bicycle pump to put in pressure can solve this issue.
2. Brine Tank Softener — Best Softening
Brine Tank Water Softener
This brine tank works with resin beads to soften hard water through ion exchange. It features a safety float to prevent flooding and requires no batteries for operation.
Pros
- Effectively softens water through ion exchange
- Safety float prevents flooding
- No batteries required for operation
- Lasts 11 to 14 years with proper care
- Adjustable float line controls salt usage
Cons
- Shouldn't be filled with water directly
- Requires periodic salt replenishment
- Takes up floor space
Are you having difficulty in washing clothes or sensing a very strong taste in your drinking water?
Well, these are signs of mineral content in your water which results in hard water.
This product is very suitable for those looking for a tank that can soften hard water.
If you’re still in doubt of whether your water is hard or not, you can buy a test kit to know the water hardness.
The brine tank comes equipped with a resin tank, which plays a significant role in softening. If you need a complete softening solution, check out the best water softener filter cartridges.
The resin tank has resin beads which do ion exchange by swapping Calcium and Magnesium in the hard water with Sodium ions.
Later, there’s the formation of the salt in the brine tank when the Sodium ions are deposited.
The formation of a brine solution follows.
Regeneration makes use of brine solution.
The regeneration process entails washing the resins (which are now saturated by the ions) by passing a brine solution through them and discharging the resultant liquid through the drain.
An added advantage of this tank is that the amount of salt used in regeneration can be regulated by the calibration of the float line, which is found in the tanks.
It’s recommended that the brine tanks shouldn’t be filled with water.
The brine tanks require no batteries, and installation is very easy.
The brine tanks also come equipped with a safety float which prevents flooding of water in the tanks.
The brine solution tanks can work for about 11 to 14 years.
The water produced is soft water, which is very healthy.
Softening the water also reduces the scales that may form in pipes, therefore, reducing cost.
You can determine the size of the tanks you require by merely multiplying the grain capacity (the highest amount of grain water hardness that the tanks can dispose of) by the amount of water needed by all the members of the family daily.
3. Well Pressure Tank — Best for Wells
Well Pressure Tank
This well pressure tank features an inner bladder that separates air from water to maintain constant pressure. It reduces pump cycling, extends pump life, and provides water even if the pump shuts down.
Pros
- Can be pre-charged for ideal pressure
- Water can be used for multiple purposes
- No air controls required
- Controllable draw-down capacity
Cons
- Water quality affects tank lifespan
- Pressure may need periodic adjustment
- Sizing depends on pump specifications
For those looking for a tank to pump water from a well, this is the best choice. You may also want a sediment filter for well water to remove sand and particles.
Fitted with an inner bladder that separates air from water.
As water is pumped in from beneath the tanks, it pushes the air chamber upwards, therefore, leading to a build-up of pressure.
This pressure is exerted on the bladder when a tap is opened, therefore pumping water out.
This particular tank provides water if a pump shuts down.
It’s also useful in decreasing the cycling of the pump, which makes the pump long-lasting.
The tanks allow water storage and the maintenance of constant pressure.
These storage tanks come in different types, that’s. Diaphragm, stainless and bladder tanks.
Check pressure using a digital gauge.
The pressure is usually above 30psi.
When choosing the size of pressure tanks, you should consider the amount of water that flows through the pump in a given period and the run-time preferred for the pump.
This is because these two factors affect the least amount of water, which can be stored by the tanks between the turning off and turning on of the pump (drawdown).
There are a few factors that affect the lifespan of the Well pressure tank.
These factors include the pump cycling, the general quality of the tanks, and the type of water that’s pumped (water that has stones may lead to the development of holes on the tanks).
You can also tell if the good pressure tanks aren’t working well by checking whether the pressure valve is letting out water.
This enables you to solve the problem on time.
4. RV Holding Tank — Best Portable
RV Holding Tank
These versatile holding tanks come in three types for fresh water, grey water, and black water management. They feature NSF certification for health inspection compliance and are portable for travel.
Pros
- Portable freshwater storage for travel
- NSF certified for health safety
- Easy installation by anyone
- Temperature of stored water can be regulated
Cons
- Requires treatment chemicals for sanitation
- Grey and black tanks need careful draining sequence
- Air flow must be maintained during use
These storage tanks are very useful at home because they have permits.
The three types of RV Holding storage tanks are the freshwater, grey and black tanks.
The freshwater tank holds pure water that can be used later, the grey water tank holds water from the shower, bathroom, and kitchen and the black tank holds toilet wastewater.
When storing the water, whether fresh or wastewater, you must equip yourself with a hose, water filtration systems, and be sure to the cleanliness of the tanks.
The grey and black RV holding tanks are then drained in a particular sequence.
The grey tank is drained first, followed by the black tank while the fresh water tank is drained into the kitchen and toilet for use.
Air should be allowed in and out of the tank when in use.
The storage tanks contain the NSF logo which assists in health inspection.
The RV holding tanks are treated in order to check that cleanliness, to get rid of any clogs, and to make sure there’s no bad smell.
The treatment chemicals come in different forms that are, liquids or tablets.
These treatment chemicals include the Walex deodorizer, the energy greywater treatment, and the happy camper organic treatment.
5. Solution Tank — Best for Cleaning
Solution Tank for Floor Machines
This tank features separate chambers for detergent and water that mix automatically when the cleaning machine is activated. Made from durable polyethylene with adjustable solution valves.
Pros
- Reduces energy required for cleaning
- Valve seals can be easily changed
- Detergent amount is controllable
- Easily attaches to vacuum cleaners
Cons
- Specific to floor cleaning applications
- Limited versatility compared to other tanks
- Requires compatible cleaning equipment
This tank has been developed to make cleaning much easier and quicker.
Some storage tanks have a detergent chamber and a water chamber whereby the detergent (carpet detergent) and water are inserted.
This tank can then be placed in a vacuum cleaner and once the cleaner is turned on, the components inside the tanks mix up.
The cleaning process can then be carried out very efficiently.
The tanks have valves for the regulation of the solution used for cleaning.
The tank-opening is broad, therefore preventing spillage of detergent and allowing the filling of the tanks.
The installation is very easy.
The material used for the making of the tanks is Polyethylene, which makes them durable.
6. Septic Tank — Best Wastewater
Septic Tank
This underground wastewater treatment tank uses natural settling and biological breakdown to process household waste. It features a T-shaped outlet to prevent scum and sludge from leaving the tank.
Pros
- Installed underground to save space
- Treated water supports soil and crop growth
- Simple and effective operation
- Reduces risk of sewage leakage
Cons
- Requires pumping every 3 years
- Repairs can be expensive
- Must avoid pouring oil or excessive detergent
The wastewater treatment tanks are the ones commonly used in rural areas for the storage and drainage of wastewater from the kitchen, toilet, and shower.
There are two types of wastewater treatment septic tanks which are, the multi-chamber septic tanks and the single septic tank.
The water enters the wastewater treatment septic tanks and is given some time to allow all the contaminants to settle below the tanks and to be broken down, forming a substance called sludge.
The grease and oil components also form a floating substance.
After the water contaminants settle forming sludge, the resultant liquid is taken through a process of treatment by soil (drain field).
The water formed is then used in the soil.
This wastewater treatment tanks are fitted with a T-shaped outlet which forms a barrier that prevents the movement of the scum and sludge.
The wastewater treatment tanks water pumping should be done every 3 years.
The purpose of pumping is removing the waste materials (sludge) that may have accumulated at the bottom of the septic tank.
When the wastewater treatment tanks are full, you’ll notice that the water in your home is draining slowly.
To enable efficiency, you should avoid pouring oil into kitchen sinks, avoid overusing detergents, and avoid throwing tablets through the kitchen sink.
The repair may be expensive. You may add oxy-tabs to your system to increase the breakdown of the organisms in the tanks.
Good quality wastewater treatment tanks can last for as long as 25 years.
7. UV Treatment Tank — Best Disinfection
UV Water Treatment System
This UV treatment system uses UV-C light rays to deactivate the genetic material of pathogens in water. The stainless steel chamber reflects UV rays for maximum disinfection effectiveness.
Pros
- Inexpensive operation using only UV light
- Environmentally friendly with no chemicals
- Easy lamp replacement with indicator
- Operates 24 hours continuously
Cons
- Doesn't remove chemical contaminants
- Lamp needs annual replacement
- Requires pre-filtration for turbid water
These form of water filtration systems are very cheap and can fit into the budgets of many of us.
It’s unique because it uses the principle of deactivation of genetic material when getting rid of bacteria.
The UV treatment water filtration systems use the UV-C light rays for the disinfection.
The UV chamber is made up of stainless steel which reflects the UV rays, therefore, increasing the ability to kill the pathogens.
The water is disinfected in a very simple way. That’s, while the dirty water is passed down through the stainless steel chamber, the UV rays begin purifying the water by making the DNA material in the pathogens inactive.
The vigor of the UV rays varies according to the type of organism.
The water treatment appliance is of very high quality.
Replacement can also be done when necessary because it doesn’t need skilled personnel.
The efficiency of this water treatment filtration systems is indisputable because almost all the organisms are killed in the process.
You don’t need to worry about its power because it comes with a charger.
You can use this in disinfecting water from the well or surface water. For well owners, pairing this with a well water sand filter provides full treatment.
The UV treatment tank works throughout the day for 24 hours straight, assuring you of spotless water.
8. Receiving Tank — Best Air Compression
Receiving Tank
This air compression tank uses compressed air cooling to produce water droplets and maintain system pressure. Built from durable steel with a fitted stability ring at the bottom.
Pros
- Uses less electricity than alternatives
- Superior security compared to electrical tanks
- Air tools can be changed easily
- Low maintenance requirements
Cons
- Specialized application limits versatility
- Air pressure must remain above 10 PSI
- Requires adequate ventilation
These tanks use the principle of air compression to produce water from the system.
The compressed air is allowed to form water droplets through cooling.
The tank is very beneficial because it provides air for the treatment system when there’s a need for it.
The tanks have stability due to a fitted ring at the bottom.
These tanks can either be wet or dry.
There’s a reduction of temperature as the air is allowed to cool.
This property makes the receiving tank function as an exchanger of heat.
The tank is created using steel, and this property makes it very durable.
The tank makes sure pulsation is reduced.
The air pressure is above 10 PSI.
9. Aeration Tank — Best Biological
Aeration Tank
This aeration tank uses microorganisms and dissolved oxygen to break down organic contaminants in wastewater. No chemicals are required as the natural biological process handles purification.
Pros
- Converts harmful metals into safe compounds
- Achieves natural soil tightness
- Reduces dissolved metal content effectively
- Easy installation process
Cons
- Requires proper ventilation for air supply
- Regular cleaning needed to prevent rust and algae
- Adequate oxygen is essential for effectiveness
The aeration tank uses air aeration to make sure wastewater treatment.
The aeration makes use of microorganisms. Therefore, you don’t require chemicals.
These wastewater treatment tanks come in two types, that’s, water-into-air aerators and air-into-water aerators.
The water-into-air aerators wastewater treatment system consist of the draft, cone, and spray aerators, while the air-into-air aerators consist of centrifugal and pressure aerators.
The aerators perform the function of putting Oxygen into the water to form dissolved Oxygen, which is taken in by the microorganisms.
The dissolved Oxygen assists the microorganisms in the feeding of organic contaminants in the water and breaks down the organic matter, which has Carbon to form carbon dioxide and water.
After feeding on the contaminants, they form flocs.
These flocs come together to form sludge.
Without the nearness of adequate Oxygen, microscopic organisms aren’t able to break down the matter on time.
When the organisms are killed, the water becomes safer for drinking.
The increase in pH in wastewater treatment occurs because the CO2 is mostly affected when it’s reduced in the water.
You should clean the wastewater treatment tanks regularly because rust, algae, or the end product of Sulphur precipitation may form on the container.
There should also be proper ventilation around the wastewater treatment tanks because the process requires a lot of air.
10. Expansion Tank — Best Pressure Control
Expansion Tank
This expansion tank absorbs pressure fluctuations caused by water heating and expansion in closed systems. It maintains approximately 55 PSI and comes in multiple capacity options.
Pros
- Controls pressure to prevent system damage
- Diaphragm design improves draw-down
- Leak-proof valve fittings
- Welded sides for easy installation
Cons
- Limited to pressure management function
- Must match system pressure requirements
- Pressure gauge needed for monitoring
When the water is warmed, it grows, expanding the weight in closed warming frameworks.
Over time, these weight vacillations can harm the system’s components.
An extension tank is planned to lighten this weight and expand the life of your framework.
It absorbs any pressure before it comes to the kitchen tap or any other home tap.
It, therefore, offers assistance to those having water pressure issues.
The pressure can be determined by using a tire pressure gauge.
To know the pressure required, you may read the instructions given.
The expansion tank maintains a pressure of about 55 PSI.
They come in different capacities.
How Can You Know Which Tank Works Best for You?
Start By Getting Familiar With All The Tanks Form
This enables you to know their benefits and setbacks.
It also enables you to relate it with your current need and figure out whether it’s the best fit for you. Understanding what filtered water is can help guide your decision.
Familiarizing yourself with the tanks enables you to know how to effectively use the tanks that you require this, knowing the items you require like a hose.
Start Calculating The Costs That You May Incur
Each tank has a cost attached to it.
The cost can be calculated through considering factors like the original price of the tanks, the amount required to install it in your home or job, and the cost of repair and maintenance.
You can do this by researching on different websites or by consulting those that have owned the tanks before since they’re more experienced.
Consider Whether The Tanks Will Be Environmentally Friendly
You can consider the chemicals that will be used in the tanks.
Another thing to consider is the make of the tanks, whether the material used to make it’s actually environment friendly.
Consider The Space
Some tanks require a lot of space, while others don’t.
First, assess the area you’ve and determine whether space can accommodate the particular tanks.
Does The Tanks Work Well With The Water Treatment System You Have?
You might want to consider the tanks that work very well with your water treatment system. Whole house systems like the best whole house water filtration systems pair well with treatment tanks.
This will save you the trouble of constant repair or strain of the system.
The above factors are critical because they will be sure to efficiency. For additional guidance on filter types, read our guide on water filter cartridge types. If chlorine is a concern, a chlorine water filter can be added to your treatment setup. Homeowners who prefer a multi-stage approach may benefit from a 3-stage water filter or a 4-stage water filter alongside their treatment tank. For lead concerns in your water supply, see our guide on the best water filter for lead. If you want to soften your water without a brine tank, learn about the differences in our water softener vs filter comparison. A carbon block water filter is also a popular pairing for taste improvement.
Frequently Asked Questions
It's a storage vessel that plays a role in treating or holding water. The type you need depends entirely on what you're trying to do -- store RO-purified water, soften hard water with brine, keep well pressure steady, treat wastewater, or disinfect with UV light. They're all water treatment tanks, just built for different jobs.
Start with the problem you're trying to solve -- that narrows things down fast. From there, think about how much space you've got, what your budget looks like, and whether the tank works with your existing setup. Don't forget to factor in installation costs and ongoing maintenance, because those add up.
It really depends on the type. Brine tanks for softeners typically last 11 to 14 years. Septic tanks can go 25 years if you maintain them well. Well pressure tanks fall in the 5 to 15 year range depending on your water quality and how often the pump cycles. RO storage tanks usually get you 7 to 10 years.
Every single one does. RO tanks might need pressure adjustments as they age. Brine tanks need salt refills. Septic tanks should be pumped roughly every 3 years. UV systems need new lamps annually. Staying on top of maintenance is what keeps these tanks performing well and lasting longer.
Final Thoughts
What I like about water treatment tanks is how straightforward the choice becomes once you know what problem you're solving. Need clean drinking water on demand? An RO tank does the job. Battling hard water? A brine tank paired with a softener is your answer.
Every option on this list is built to last and offers solid value for the price. Some are portable, some go underground, and they cover everything from residential homes to RVs and farms.
The key is matching the tank to your specific situation. Take a close look at each one before you buy -- your water quality (and your wallet) will thank you.
Match the tank type to your specific need: RO tanks for purified water storage, brine tanks for softening, well pressure tanks for consistent pressure, and septic tanks for wastewater. Consider space, budget, and compatibility with your existing system before purchasing.
