Confused FC 1.0 - 3.0 ppm or 5.0 -9.0

Oct 2, 2020
14
Houston
Hi ,
my test kit it states ideal FC 1.0 - 3.0 however the pool calculator in the App is stating 5.0 -9.0.Which is it? My CYA is 50.

All help much appreciated.

steve
 

JJ_Tex

Gold Supporter
Bronze Supporter
Jul 17, 2019
2,318
Prosper, TX (DFW)
Pool Size
13000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
What kind of kit do you have?

Here we look at the FC/CYA ratio (see link in my signature) to determine your FC based on your CYA. That is a newer way of pool management vs what you might see printed on some test kits, pool stores, etc.
 

Dirk

Gold Supporter
TFP Guide
Nov 12, 2017
8,624
Central California
Pool Size
12300
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
To answer your question... Since it's not in your signature, we're assuming you do not use a salt water generator (SWG). Also, you didn't actually say which app you're using. If your CYA is 50, then you'll want to keep your FC between 6–8. You can safely ignore FC recommendations from pool stores, pool guys and even pool test kits. This is the source you can rely on:

 
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