Home / Water Systems / Dual Tank: City Water
Dual tank water softener and carbon filtration for city water.
Our largest city-water system. Instead of sharing one tank, the softening resin and the carbon each get a dedicated tank, bridged by a single control valve. That gives 96,000 grains of softening and a carbon bed that backwashes itself.
Dual Tank: City Water: quick answers
Why two tanks instead of one?
Each media does its own job in its own tank, and both tanks can be backwashed to keep the media clean.
Separating carbon from resin gives you more of each, which suits heavily used systems.
Who is it for?
Large homes, high water use, pools, guest houses, or big households.
If your home runs water nearly all day, the extra capacity keeps regeneration manageable.
Does it remove chlorine?
The dedicated coconut shell carbon tank reduces chlorine taste and odor for the whole house.
It does not purify drinking water; pair it with reverse osmosis for that.
Dual Tank City Water specifications
| Softening capacity | 96,000 grains |
|---|---|
| Configuration | One softening tank and one dedicated carbon tank, bridged by one control valve |
| Softening resin | ResinTech CG10, 10% crosslinked |
| Carbon | Granular activated coconut shell carbon (Jacobi) |
| Tanks | Enpress fiberglass |
| Brine (salt) tank | 15″ x 35″ square |
| Control valve | ProValve with ceramic discs and 72-hour memory backup |
| Valve flow rate | 28 gallons per minute |
| Service flow | 27 gallons per minute at a 15 psi pressure drop |
| Regeneration | Upflow, counter-current, demand-initiated (meters actual water use) |
| Backwash flow | 3.0 gallons per minute |
| Bypass | 1″ full-flow bypass valve, included |
| Connections | 1″ NPT; 1.25″ high-flow distributor tube |
| Operating pressure | 30–125 psi |
| Water temperature | 40–110°F |
| Power | 120V outlet with 12V transformer |
Specifications from the distributor’s product sheet. Your quote lists the exact equipment.
Who it’s for
- Large homes and high-use households
- Homes with pools, casitas or constant demand
- Owners who want the most carbon and softening capacity on city water
What it won’t do
- It doesn’t purify drinking water.
- It isn’t designed for iron or sulfur. Well homes should look at the Well Water dual tank.
- It needs more garage or side-yard space than a single-tank system.
Certified components
- Control valve: certified to NSF/ANSI 44
- Fiberglass mineral tank (Enpress): certified to NSF/ANSI 44 and 61
- Coconut shell carbon (Jacobi): certified to NSF/ANSI 61
- Softening resin: ResinTech CG10, 10% crosslinked
These are certifications of individual components for material safety and softener performance. They are not a contaminant-reduction certification for the complete system.
Warranty
| Media tanks, storage tanks and brine tank | Lifetime |
|---|---|
| Ceramic valve discs and system dry parts | Lifetime |
| Control valve body and circuit board | 5 years |
| Filtration media (resin and carbon) | 5 years |
| Installation labor | 1 year from purchase |
Coverage applies to the original purchaser under normal operating conditions. Read the full warranty →
Price
Most Happy Tap systems fall between $2,950 and $6,950, depending on the setup: city or well water, the size of your home and household, and how much plumbing the install needs. Your quote is one written number before any work starts. Installation is available through licensed Arizona plumbing professionals.
Frequently asked questions
How much space does a dual tank need?
Two media tanks plus a salt tank. We check your equipment location during the water test.
Is a dual tank worth it for a normal-size home?
Usually not. Most 3–4 bedroom homes are well served by the Standard system.
Does it need a drain and an outlet?
Yes, both, like any salt-based softener.
Other Happy Tap systems
Standard Softener + Filtration
48,000 grains. Softening and chlorine filtration in one tank. Our most popular system.
View system →XL Softener + Filtration
64,000 grains for larger homes, bigger households or harder water.
View system →Dual Tank: Well Water
Softening plus Katalox Light media for iron, manganese and sulfur smell.
View system →Salt-Free Conditioner
Scale prevention with no salt, no drain and no power. Does not soften.
View system →Tankless RO (800 GPD)
Seven stages, water on demand, no storage tank under the sink.
View system →5-Stage Tank RO
A proven under-sink RO system with a storage tank and alkaline stage.
View system →Add-ons: Alkaline & UV
Remineralize RO water, or add whole-home UV for well water.
View system →Not sure which one fits?
We test your water at your sink, explain the numbers, and size the system to your home. Free, and no pressure.