Won’t hold chlorine

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MarcsPool

MarcsPool

Member
Jun 2, 2023
10
Richmond, Texas 77469
Pool Size
24000
Surface
Plaster
Chlorine
Liquid Chlorine
I’ve had my pool for about 25 years and, except for the early years, I’ve maintained it pretty good. This spring I went on vacation and the pool got away from me. Came back to algae infested green pool. I bombed it with chlorine but the problem, as I’ve since found out, was I was bombing it with sanitized chlorine. CYA went up and I think I fell into a chlorine lock. I’ve been trying to get it to maintain chlorine since (about 3 weeks now). I triple shocked it with cal-hypo about 4 days ago and it held chlorine for less than a day. The algae is under control, the CYA I’ve gotten down to 78 from 148 but still won’t hold chlorine. I seldom go to Leslies but have been lately to get my water tested. I’m suspect of their results because it’s always something different every time I go. I bought a Taylor K-2005 test kit from Amazon and it won’t be near until tomorrow. Any opinions on where to go next? I really want to avoid a prolonged SLAM if i can help it.
 
Let's take a look at your numbers once you get the test kit. You will also need to purchase the Taylor K1515C FAS-DPD chlorine test (this is required for SLAM and it will turn your K-2005 into the recommended K-2006).

In the meantime, add 5 PPM worth of liquid chlorine until you get your kit (use the PoolMath app's "Effects of Adding" to get the right amount).
 
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MarcsPool said:
I’m suspect of their results because it’s always something different every time I go.
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Exactly! :goodjob: Something we say here dozens of times each day. Testing your own water is a MUST and you don't have to have a special computer or PHD to do it.

Here is the link for the FAS-DPD that will essentially upgrade your K-2005 to a K-2006. If you are up to it, we also recommend the Smart Stir. Use it once and you'll see why.

Start reading the SLAM Process page and you'll be all set when your stuff arrives. Welcome to TFP! :wave:
 
So, to be clear, if the pool needs to be SLAM’d the amount of bleach needed to bring it up to the suggested FC level is just what’s needed for the first go-round. I’ll need more just to keep it maintained, right?
 
So i added the correct amount of bleach to raise the FC level to the recommended 10 ppm. After 4 hours I did the FAS-DPD test and came up with 1.2ppm. Does that sound right? I’ll go pour more bleach in the pool…..
 
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