# Thread: Stenner Pump Flow Rate

1. ## Stenner Pump Flow Rate

I am considering installing a Stenner pump (or a similar apparatus) to continuously add chlorine to the pool. My wife and I take frequent trips, and I am tired of coming home to algae. I am in southwest Florida, which means the pool gets a lot of intense sun. It is about 12,000 gallons and has about 300 square feet of surface area. Is there a simple formula I can use to estimate how much chlorine I should be adding daily? Of course I'll still be testing the water and making regular corrections, but it would be nice to have something other than a wild guess to use as a starting point.

2. ## Re: Stenner Pump Flow Rate

Welcome to TFP!!!

How are you maintaining the chlorine now?

FC consumption is dependent on pool specifics, size, debris load, sun exposure, stabilizer (CYA) level etc. It is typical for a pool to require 2-4ppm of FC to be added daily.

You can use PoolMath to calculate how much bleach is likely to be required daily.

3. ## Re: Stenner Pump Flow Rate

Originally Posted by jblizzle
Welcome to TFP!!!

How are you maintaining the chlorine now?
Thanks for the prompt reply. I currently test the chlorine every other day or so. If it is low, I use the pool calculator to decide how much 10% liquid bleach to add. The problem is that if we leave for more than a few days, we invariably come back to algae. I used to use a floater with chlorine tablets while we were away, but my CYA is already higher than it should be.

I still haven't decided between a SWG or a Stenner pump. If I go the Stenner pump route, adding 2ppm per day sounds like a good place start. Thanks for the advice.

4. ## Re: Stenner Pump Flow Rate

Since you have been adding bleach ... how many ppm of FC are you typically adding every other day? That is a better place to start from.

What is your CYA level? How low have you been letting the FC get on a daily basis?

5. ## Re: Stenner Pump Flow Rate

Originally Posted by jblizzle
Since you have been adding bleach ... how many ppm of FC are you typically adding every other day? That is a better place to start from.

What is your CYA level? How low have you been letting the FC get on a daily basis?
I haven't really been keeping track, but I will start. I'd say I add about a half a gallon to a gallon of the 10% bleach in a typical week. My CYA is at currently at 80, although every time we have a heavy rain, I drain a couple of inches, so it is going down gradually. I try to keep my FC between 4 and 6.

6. ## Re: Stenner Pump Flow Rate

Well, that is why you keep getting algae. Your FC level is too low.

With a CYA of 80ppm, according to the FC/CYA Chart, your FC should NEVER be allowed to get below 6ppm. So you likely need to be targeting 8-9ppm every day.

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