How to deal with inconsistent FC additions depending on current water level?

Itsmejson

Well-known member
Aug 1, 2023
50
Liberty Hill, TX
Pool Size
11000
Surface
Fiberglass
Chlorine
Liquid Chlorine
Running into a situation and trying to figure out the best way to handle it.

In the pool math app my pool volume is at 11800, which I calibrated my FC chemical add based on what the pool math app suggested and then 30 mins later I tested again to make sure FC level matched.

When my water level gets low I add and my pool volume changes, which in turn affects FC chemical adds. As an example tonight I added 75 fl oz to go from 6 to 11 ppm, however after 30 mins and testing again it only raised FC to 9.5. Playing around in pool math under effects of adding I get a pool volume of 16800 gal which would match the 75 fl oz addition.

How do you all handle these variations? I feel like it would be best to just increase my pool volume in pool math app? Could it be the liquid chlorine I have be less effective due to the age or something?
 
How do you all handle these variations? I feel like it would be best to just increase my pool volume in pool math app?
16.8K seem extreme from 11.8K. Try the volume about 13K. If you overshoot, lower volume by 500K, repeat. (if you undershoot, raise volume by 500g). Multiple iterations, with pH or FC changes, will dial you in.
Could it be the liquid chlorine I have be less effective due to the age or something?
Absolutely.
 
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