Sudden CYA drop and no FC yet this season

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M

MProchaska

New member
Jun 11, 2023
1
Massachusetts
Pool Size
10000
I opened my pool on May 13 and have not been able to hold chlorine yet.

A week ago my CYA was 56. I don’t know how it dropped to 5 today. I backwashed twice and added a bit of water this week but not much.

I tried to super chlorinate with cal hypo (9 bags two nights ago) and still woke up to zero FC.

I’m working on getting CYA up before I try to super-chlorinate again. Going to try liquid chlorine this time. Do I need to SLAM? I never have before but I’m thinking that might be the only way to go.

Here are today’s test results:
FC: .09
TC: .09
PH: 7.5
TA: 119
CH: 250
CYA: 5

10,000 gal pool. Sand filter.
 
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MProchaska said:
I opened my pool on May 13 and have not been able to hold chlorine yet.

A week ago my CYA was 56. I don’t know how it dropped to 5 today. I backwashed twice and added a bit of water this week but not much.

I tried to super chlorinate with cal hypo (9 bags two nights ago) and still woke up to zero FC.

I’m working on getting CYA up before I try to super-chlorinate again. Going to try liquid chlorine this time. Do I need to SLAM? I never have before but I’m thinking that might be the only way to go.

Here are today’s test results:
FC: .09
TC: .09
PH: 7.5
TA: 119
CH: 250
CYA: 5

10,000 gal pool. Sand filter.
Click to expand...
If those are pool store or test strip results, don’t do anything based on them. Get one of the Taylor test kits recommended on TFP and keep adding liquid chlorine until you can bet it to hold above zero. Make sure the liquid is plain chlorinating liquid.
 
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