Why is it calculating weirdly… I’m sure it’s me...

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sedalbj

Silver Supporter
Jul 3, 2016
53
Fort Worth TX
Pool Size
38000
Surface
Plaster
Chlorine
Liquid Chlorine
I’m sure it’s me, but need someone to tell me why! I have used the app for several years with my old pool, moved houses so new pool (new build). I must have a setting wrong.

My pool gallons are set to plaster, 38000. My Test Kit is TF-100, and the reagents are about 6 mths old.

I needed FC to go from 0 to 12 (SLAM). 4 gal of 10% got me to FC5.5, 6 gal of 10% got me to FC7, 9 gal 10% to FC11.
The app, when I was initially at FC0 with target FC12 it recommended I add 4 gal, 2 qts (the sanitizer type is set to liquid chlorine, 10%, 128oz jugs). That is far from the 9 I added. (my chlorine expires 1/6/26)

Also, Calcium Hardness. Current is 275, target is 450. It recommends adding 62 lbs (setting is Calcium Chloride). 62 lbs? It took @25 lbs to get it to 275 (super soft fill water).

So, the FC target recommended addition was too low, but then the Calcium seems really high? I tracked my SLAM numbers because I wanted to use them to verify the # of gal in my pool, but this isn’t making sense.

I don’t understand the chemistry of how all this works, I’m just appreciative of the smart people who gave me the tools and the instructions on how to use them! Smart people, help me out :)
 
sedalbj said:
he app, when I was initially at FC0 with target FC12 it recommended I add 4 gal, 2 qts
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This is the correct amount of 10% to add 12 ppm FC to a 38,000 gallon pool. Each gallon of 10% adds about 2.6 ppm FC to your pool.

Chlorine doesn't usually have an expiration date, it should have a manufacture date on it. What numbers are actually on the bottle?

sedalbj said:
lso, Calcium Hardness. Current is 275, target is 450. It recommends adding 62 lbs (setting is Calcium Chloride). 62 lbs? It took @25 lbs to get it to 275 (super soft fill water).
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The recommendation looks right to me.
 
JamesW said:
What are the dimensions of the pool?
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Pool is 40’x20’, 8 ft deep end, 3.5 ft shallow. Pool builder estimated 38000 with the spa. Calculators estimate about 35000. Hoping to verify it using the calculation of FC.
JamesW said:
Maybe the liquid is really weak; it happens more than you would think.
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Maybe? It was a new shipment to their store.
JamesW said:
Actual CH of fill?
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Our water is very soft out of the ground.
Donldson said:
Chlorine doesn't usually have an expiration date, it should have a manufacture date on it. What numbers are actually on the bottle?
Click to expand...
The chlorine doesn’t have the manufacture date, only the expiration.
 
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