SLAM - do I HAVE to wait for my CYA to get up before proceeding with chlorine?

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A

Arcpool13

Member
May 5, 2020
22
Maryland
Pool Size
24000
Surface
Vinyl
Chlorine
Liquid Chlorine
This is our third year needing to SLAM the pool. Each time we have opened, pool has zero chlorine and likely 0 CYA (black dot doesnt disappear when testing for CYA). I put the CYA granulars in a sock in the skimmer and it typically takes days to dissolve. I know that CYA needs to be 30-40 to keep from wasting the chlorine. Is it proper to wait for the CYA to get where it needs to be, or given that this pool needs lots of chlorine anyway in the SLAM process, is it okay and not wasteful to go ahead and start getting my chlorine in there?

Many thanks.
 
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No. You don’t need to wait. CYA can take days to dissolve. Go ahead and SLAM based on the current CYA value (which is zero, of course). Then make adjustments as needed as your CYA climbs. Also, if you wait til the sun sets, you will lose less FC initially.
 
A little different view -- once you start to add the CYA using the sock method, assume it is in the water for your target level and use that for your SLAM level FC.
Also, add the liquid chlorine now. No need to wait for the night. Sooner the better.
 
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