What Is This?

Hackurs

Member
Mar 14, 2025
9
Arizona
Surface
Plaster
Chlorine
Liquid Chlorine
There’s a drain on the left, and the lower center piece has water pumping into the container when the pump is on. I thought it was an overfill drain, but that would be a huge waste of water?

Can anyone tell me what this is?
 

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The canister looks small enough to be an autofill but you don't have the top of the valve in it. Is your pool getting too full because the autofill won't turn off? This would connect to a source at a hose bib most likely. Can you turn it off there?
 
Likely an A&A Dek-Chlor - an in-deck tablet feeder. There should be a 3/4" valve at your equipmemt pad to regulate the water flow.

If you intend to use it, use only 3" trichlor tablets.

The nipple in the center has 2 holes in it to allow water to flow out. The standpipe allows water to overflow into it. The overflow line leads to an outlet in the pool wall about 18" or so below the pool waterline and directly adjacent to this in-deck canister. You adjust the water flow using the valve atthe equipment pad.

Show use a few pics of your equipmemt pad and we can help identify the valve for this.
 
There’s a drain on the left, and the lower center piece has water pumping into the container when the pump is on. I thought it was an overfill drain, but that would be a huge waste of water?

Can anyone tell me what this is?
Autofill. Looks like you have a low-profile fill valve at the bottom. Yes, that's what is used in a toilet tank.
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Likely an A&A Dek-Chlor - an in-deck tablet feeder. There should be a 3/4" valve at your equipmemt pad to regulate the water flow.

If you intend to use it, use only 3" trichlor tablets.

The nipple in the center has 2 holes in it to allow water to flow out. The standpipe allows water to overflow into it. The overflow line leads to an outlet in the pool wall about 18" or so below the pool waterline and directly adjacent to this in-deck canister. You adjust the water flow using the valve atthe equipment pad.

Show use a few pics of your equipmemt pad and we can help identify the valve for this.
You sir, are a mensch. That’s likely exactly what it is. I’ve attached pad pics below. Thank you! I get to get rid of the stupid unicorn floater.
 

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The Red handled ball valve controls the flow to the DekClor. The more water flow into the DekClor, the faster the tabs will dissolve.
I always have water flowing thru mine - even though I don't use tabs any longer.

We recommend liquid chlorine over tablets. Tablets add CYA (stabilizer). Being in AZ (like me) you will go thru a lot of tabs and the CYA will build with each tab. Many of us have switched to SWG as, in the long run, the SWG is cheaper than other chlorination forms.
 
The Red handled ball valve controls the flow to the DekClor. The more water flow into the DekClor, the faster the tabs will dissolve.
I always have water flowing thru mine - even though I don't use tabs any longer.

We recommend liquid chlorine over tablets. Tablets add CYA (stabilizer). Being in AZ (like me) you will go thru a lot of tabs and the CYA will build with each tab. Many of us have switched to SWG as, in the long run, the SWG is cheaper than other chlorination forms.
My good sir, I am in Tucson! I understand your plight. Lol. I actually am using both tabs and liquid to keep the CYA at ideal levels.

Thank you for the assist with levers as well. I put two tabs in the canister and my chlorine jumped up to 9! Definitely turning it down this morning.
 
My good sir, I am in Tucson! I understand your plight. Lol. I actually am using both tabs and liquid to keep the CYA at ideal levels.

Thank you for the assist with levers as well. I put two tabs in the canister and my chlorine jumped up to 9! Definitely turning it down this morning.
Long term solution is to install a SWG and also use softened water for the autofill.
For the month or so in winter, when the SWG won't produce due to low water temps, I use a gallon or two of liquid chlorine in total.
 
Long term solution is to install a SWG and also use softened water for the autofill.
For the month or so in winter, when the SWG won't produce due to low water temps, I use a gallon or two of liquid chlorine in total.
That’s perfect, I actually have a water softened home! Thanks for the help!