Finally SLAM is done and water is crystal clear - but

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f1loco

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Aug 8, 2024
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On testing this morning, all looks pretty good. A couple cups of acid and 2 gallons of liquid stabilizer but I think I need to run to store to get some calcium increaser -

FC 22
CC 0
pH 7.8 (before the acid)
TA 70
CYA 30
CH 250
Salt 3200
CSI -.12

Is it normal for CH to be low after a SLAM? PoolMath says 25lbs at a target of 400 (SWG and plaster - 18K). In 14 years of living here I don't think I have ever had to worry about CH levels. Ended up with 16lbs and ACE only had 4 bag of HTH left.

The other issue is now the water is so clear the mottling on my plaster looks worse, but alas there is nothing I can really do about that.
 

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I wouldnt mess with the calcium increaser, just let your pH hang out around 7.8 - 8.0.

Speaking of pH, when your FC is that high the test is inaccurate so don't test for pH until your FC is below 10 and for sure do not adjust anymore until it comes down.
 
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If you backwashed a lot during the slam it could lower your CH. Calcium won't decrease with evaporation; it only decreases thru splash out, leaks, or backwash. What was it before the slam, or what was it 6 months ago?
 
RickRude said:
If you backwashed a lot during the slam it could lower your CH. Calcium won't decrease with evaporation; it only decreases thru splash out, leaks, or backwash. What was it before the slam, or what was it 6 months ago?
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Just switched to TFP before the SLAM. Pool store kept telling me everything was fine and I was like no, it's hazy. They've never said before my CH was on the low end. Always adjusting the FC, TA, CYA, or salt. Really can't recall last time I had a CH reading but know I've been told to add any. Only flushed the cartridge once during SLAM, but we did have a few nights of heavy rain during the SLAM.

EDIT: looked at my testing on 8/12 and was reading 250 as well. Will try to get everything else in parameters, retest and add accordingly I suppose.
 
Also keep in mind that calcium doesnt evaporate and your fill water will have some calcium, so it will naturally rise as it evaporates and you add new water.

If you are dead set on adding, aim for the low end of the target. I would also do a CH test on your tap water to see how hard your water is. Once the calcium is in there, the only way to get it out is to drain.
 
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