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Contact Retention Tank 1465 40 Gal. 1", 1-1/2" or 2" In-Out With Drain
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Description
CWS-1465 · 40 gallon · bottom drain
40 Gallon Contact Tank with Bottom Drain
Gives injected chlorine, peroxide or soda ash time to mix and react before the water reaches your filter. Sized for wells up to about 20 GPM.
- Built-in baffling. Water goes down the center tube and rises through the whole tank, so it can't short-circuit from inlet to outlet.
- Bottom drain. Flush oxidized iron and sediment without disconnecting anything.
- Heavy duty. Seamless polyethylene liner in a fiberglass shell, rated 125 psi. No metal and no coating to fail.
- 5-year warranty from date of purchase.
How the Water Flows
- Incoming water goes down the open center tube and discharges near the bottom of the tank.
- It rises through the full tank volume, so every gallon gets contact time instead of short-circuiting to the outlet.
- Outgoing water leaves at the top.
Which Size
For odor, iron, manganese and soda ash pH correction, the chemical needs to mix and react before it reaches the filter media. That often takes 30 to 60 seconds. Pick the tank that gives you about 2 minutes at your well's peak flow:
| Tank | Peak flow up to |
|---|---|
| 15 gal | about 10 GPM |
| 30 gal | about 15 GPM |
| 40 galTHIS TANK | about 20 GPM |
| 50 gal | about 25 GPM |
| 70 gal | about 35 GPM |
| 90 gal | about 45 GPM |
| 110 gal | about 55 GPM |
Installation
- Order: injection point, then contact tank, then filter. With a pump on the well pump circuit, inject before the pressure tank. With a flow-paced pump, the injection point can go after it.
- Head: grease the O-ring with the included silicone grease and thread the head on hand-tight. Nothing on the tank threads.
- Connect the inlet and outlet as shown in the piping guide. Incoming water must feed the center tube.
- Fittings into the head: pipe joint compound or Teflon paste. No Teflon tape, and don't overtighten.
- Vacuum relief valve included (required for warranty): install it on a tee on the inlet pipe.
- Copper or steel pipe: flex connectors on the inlet and outlet.
- Unions on the inlet and outlet so the head can come off for service.
- Drain: ball valve on the bottom drain. Flush once a year.
Compare Contact Tanks
| Code | Model | Capacity | In/Out | Drain | Dimensions |
|---|---|---|---|---|---|
| T2002080 | CWS-1054 | 15 gal | 1" | No | 10.2" D x 54.5" H |
| T2002370 | CWS-1054 | 15 gal | 1" | Yes | 10.2" D x 54.5" H |
| T2002090 | CWS-1354 | 30 gal | 1" | No | 13.2" D x 54.3" H |
| T2002380 | CWS-1354 | 30 gal | 1" | Yes | 13.2" D x 54.3" H |
| T2002140THIS TANK | CWS-1465 | 40 gal | 1", 1-1/2" or 2" | Yes | 14.3" D x 74.0" H |
| T2001820 | CWS-1665 | 50 gal | 1", 1-1/2" or 2" | Yes | 16.2" D x 75.2" H |
| T2002100 | CWS-1865 | 70 gal | 1", 1-1/2" or 2" | Yes | 18.1" D x 77.6" H |
| T2001830 | CWS-2162 | 90 gal | 1", 1-1/2" or 2" | Yes | 21.4" D x 74.4" H |
| T2001840 | CWS-2465 | 110 gal | 1", 1-1/2" or 2" | Yes | 24.2" D x 79.1" H |
Heights are the tank on its base. The head adds about 3". Ozone tanks are a different design: see ozone contact tanks.
Questions
Do I need the static mixer?
Not usually. The tank does the mixing. An in-line static mixer helps when the injection point is close to the tank, or with soda ash on a flow-paced pump, where you want the solution blended before it enters the tank.
Can I use my pressure tank as the contact tank?
No. Water flows past a pressure tank on a tee, not through it, so it gives almost no contact time.
Are these tanks NSF certified?
The tank is. The fiberglass vessel is NSF certified (NSF/ANSI 44), with a polyethylene liner that meets FDA 21 CFR 177.1520 for drinking water contact. The head, center tube and fittings are separate parts and aren't covered by the tank's certification, so the assembled contact tank as a whole isn't NSF certified.
Why 125 psi when the tank is rated 150?
The plastic head is the limit. The tank itself is rated 150 psi; the assembly is rated 125.
Warranty
5 year warranty from date of purchase. Contact tanks installed without a vacuum breaker are not covered under warranty
