ccbill

Well-known member
Jul 23, 2021
140
Atascadero, Ca
Pool Size
23000
Surface
Plaster
Chlorine
Liquid Chlorine
I usually wait till the next day to test after adding cya - usually subsequent tests are the same. If you are confident that your volume is close you should trust the pool math calcs. Be sure to log your chemical additions in pool math it helps to be able to look at what you did when
 
Last edited:

weq92f

Member
Aug 10, 2021
13
North Texas
.
I've been keeping the FC level somewhat consistently high, in accordance with the CYA/FC chart for SLAM, for a couple days. I ~may~ be seeing a decline in the FC consumption rate. CYA is now 30 and pH is 7.8 ... I've gone through over 20 gallons of chlorine. Hopefully there's a point at which the chlorine starts to hang around longer? What is responsible for crunching through all the chlorine?
 

reggiehammond

Gold Supporter
Oct 4, 2020
375
Fort Worth, Texas
Pool Size
30000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-60 Plus
.
I've been keeping the FC level somewhat consistently high, in accordance with the CYA/FC chart for SLAM, for a couple days. I ~may~ be seeing a decline in the FC consumption rate. CYA is now 30 and pH is 7.8 ... I've gone through over 20 gallons of chlorine. Hopefully there's a point at which the chlorine starts to hang around longer? What is responsible for crunching through all the chlorine?
UV, heat and organics.

At this time of year in north Texas, cya of 30 may be too little to stand up to high Summer.
Also - FYI pH is inaccurate above FC of 10
 

Mdragger88

Bronze Supporter
Jun 1, 2018
3,158
Hernando, Ms
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
You’re in the Pool Owner Patience part now… just keep feeding the beast!
Consistency in maintaining slam level is key. Also not sure if it’s been mentioned but scrub all your nooks & crannies. Algae likes to hide! Check weir doors (foam), skimmer throats, drain covers, ladders & their rails, light niches, & water features. 🦠
Before u know it you’ll be looking @ tfp clear water & passing an Overnight Chlorine Loss Test.
How does the water look 👀 currently?
 

reggiehammond

Gold Supporter
Oct 4, 2020
375
Fort Worth, Texas
Pool Size
30000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-60 Plus
.
This morning my FC=3!!!!!!!! This is the first time a morning test showed anything better than essentially zero! Then we got a couple inches of additional pool water via a thunderstorm :(
That worries me a lot that you’re running FC that low, regularly.
Your FC should be 5-6, all the time; flirting with or going below the minimum will keep you in a never-ending algae battle.
 

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weq92f

Member
Aug 10, 2021
13
North Texas
That worries me a lot that you’re running FC that low, regularly.
Your FC should be 5-6, all the time; flirting with or going below the minimum will keep you in a never-ending algae battle.
If I could wave a magic wand over the pool and just have it regulate itself to FC=5-7 all the time I would. But for now I have to constantly monitor and adjust FC. After an entire night of no monitoring and no adjusting, the FC level drops to near zero. Nothing I can do about that short of staying up all night with the pool -- not something I'm going to do. It is a win in my book to have seen FC > 0 in the morning. If my thinking is wrong, please set me straight :)
 

ccbill

Well-known member
Jul 23, 2021
140
Atascadero, Ca
Pool Size
23000
Surface
Plaster
Chlorine
Liquid Chlorine
The pool volume in your PoolMath logs is quite a bit different than in your signature, make sure you have it correct in PoolMath.

If I have a sense of how much will be lost overnight I try to make sure the chlorine level is high enough in the evening so that by morning it is still at SLAM levels. Repitition and recording test results helps me get that feel...
 

Mdragger88

Bronze Supporter
Jun 1, 2018
3,158
Hernando, Ms
Pool Size
26000
Surface
Vinyl
Chlorine
Salt Water Generator
SWG Type
Intex Krystal Clear
If I could wave a magic wand over the pool and just have it regulate itself to FC=5-7 all the time I would. But for now I have to constantly monitor and adjust FC. After an entire night of no monitoring and no adjusting, the FC level drops to near zero. Nothing I can do about that short of staying up all night with the pool -- not something I'm going to do. It is a win in my book to have seen FC > 0 in the morning. If my thinking is wrong, please set me straight :)
If you are losing more than 1 ppm fc overnight there are still organics consuming your fc.
After you complete the SLAM Process - which includes passing all 3 end of slam criteria you should be able to maintain a proper fc for your cya (above minimum) if you dose to the high target once per day - this is assuming u have a cya in the 40-50 range to prevent excessive fc loss from uv.
Average fc loss of most pools is 2-4 ppm/day.
 
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