Crystal Clear Water, No FC

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Weemonks19

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Jun 10, 2017
11
Londonderry, NH
Hi Everyone. Having reviewed much of the content on this site, I think I may know the answer but wanted to gather your thoughts as well. My brand new 16k gallon pool with PebbleFina interior finish was filled less than 3 weeks ago. My levels are fairly stable, but there is virtually no FC in the water. When I test using my Taylor K-2006 kit, the sample is clear, although I can see a slightly pink tint to it when I pour the sample out from the test tube. I am using trichlor tablets (yes, I know, not recommended) in an in-line feeder and the dial is now set to its highest setting. My home faces S/SE, so my pool is in direct sun from roughly 8 AM until 7 PM. I am also running a Paramount Clear O3 Ozonator and UV combination as a secondary sanitizer (overkill and likely useless in an outdoor pool, I know. wish I found this site before committing to the setup). I assume the combination of sun and UV system is a contributor to the lack of FC, but can't imagine either or both would contribute that significantly to the overall reduction. The pool water is crystal clear and at night with the interior pool light on the surface is like glass. I was thinking it may be time to conduct an OCLT, but wanted your feedback. Below are my levels as of 630 AM this morning:

FC: 0
TC: 0
pH: 7.6
TA: 50
CH: 200
CYA: 20 (this is an approximation. the sample clouds and the black dot becomes invisible just above the 30 PPM measurement line)
Temp: 78 degrees

Any suggestions on next steps would be greatly appreciated. Thanks! - Jon
 
Welcome.

1) How often are you testing?
2) Do you have one of the recommended test kits?

You'll lose Chlorine at about 2-4 ppm per day and the range for FC at 20 CYA is 3-5. An OCLT is probably the next step for you but seeing as the sun won't set for about 10 hours, I'd get a a few jugs of liquid chlorine or extra strength bleach with no additives, dose your pool to the high point of the range during the day today, and do an OCLT tonight (Start after 9:00 to be safe and take tomorrow's reading before 5:20). I'd also suggest bumping your CYA a touch, although if you are using tablets that will rise on it's own.
 
Without measurable CYA (30+) in the water, The sun is rapidly depleting the FC provided by the pucks.

I suggest you add enough CYA to get to 40 ppm. Calculate the dose and put it in ASAP.

Secondly, I suggest you ditch the pucks and start using liquid chlorine but you know that already. Calculate a dose of liquid chlorine to get to about 5 ppm and put it in your pool.

That ozone contraption actually contributes just slightly to your FC depletion as well......run it if you like, but shutting it off may be more helpful.

As you are learning there are few ozone fans on this forum.
 
Husky25 said:
Welcome.

1) How often are you testing?
2) Do you have one of the recommended test kits?

You'll lose Chlorine at about 2-4 ppm per day and the range for FC at 20 CYA is 3-5. An OCLT is probably the next step for you but seeing as the sun won't set for about 10 hours, I'd get a a few jugs of liquid chlorine or extra strength bleach with no additives, dose your pool to the high point of the range during the day today, and do an OCLT tonight (Start after 9:00 to be safe and take tomorrow's reading before 5:20). I'd also suggest bumping your CYA a touch, although if you are using tablets that will rise on it's own.
Click to expand...

Thanks for your reply and advice! I am testing daily while still in the 28 day start up period for the new pool. I am using the Taylor K-2005 kit provided to me by the PB. But it seems I am short a few supplies based on the recommended kits. I did add a bit of liquid stabilizer this evening to try and give my CYA a bump. Ideally, if I can get into the appropriate range in the coming days I will just quit the trichlor and start using bleach or chlorine as a sanitizer.
 
duraleigh said:
Without measurable CYA (30+) in the water, The sun is rapidly depleting the FC provided by the pucks.

I suggest you add enough CYA to get to 40 ppm. Calculate the dose and put it in ASAP.

Secondly, I suggest you ditch the pucks and start using liquid chlorine but you know that already. Calculate a dose of liquid chlorine to get to about 5 ppm and put it in your pool.

That ozone contraption actually contributes just slightly to your FC depletion as well......run it if you like, but shutting it off may be more helpful.

As you are learning there are few ozone fans on this forum.
Click to expand...

Thanks for the reply and advice Dave! I added some liquid stabilizer this evening and will check my CYA level again tomorrow. Do you know if it is safe to add liquid chlorine or bleach while using the trichlor pucks? My inline feeder has several warnings posted to not add/mix Cal Hypo while using trichlor. I wasn't sure if the same was true of liquid chlorine or bleach. Of course, I am not planning to add it to the inline feeder itself, but I didn't know if it was fine to still add it to the water with the feeder on. Just don't want to accidentally mix anything I shouldn't be.
 
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