Slow FC reduction.

[rachelbopt]

I ran into a problem last year with my FC staying high. It wouldn't come down for weeks even after removing chlorine and staying in the sun. Now last year I wasn't doing the full TFP method.
This year I've been following the method (for which I'm eternally grateful!) And it's been a stellar summer. I'm not closing yet but preparing and I've noticed this week that my FC isn't moving and I don't want to run into the same problem. It was 5.5 yesterday. I had to lower pH a bit last night and did not add chlorine. Today FC is 6 - tested twice with FAS-DPD. It's getting cooler and we're no longer swimming. The rest of my test results are below. Any ideas?

FC - 6
pH - 7.6
TA - 50
CYA - 35

10000 gal vinyl, liquid chlorine

 

[Bperry]

I ran into a problem last year with my FC staying high. It wouldn't come down for weeks even after removing chlorine and staying in the sun. Now last year I wasn't doing the full TFP method.
This year I've been following the method (for which I'm eternally grateful!) And it's been a stellar summer. I'm not closing yet but preparing and I've noticed this week that my FC isn't moving and I don't want to run into the same problem. It was 5.5 yesterday. I had to lower pH a bit last night and did not add chlorine. Today FC is 6 - tested twice with FAS-DPD. It's getting cooler and we're no longer swimming. The rest of my test results are below. Any ideas?

FC - 6
pH - 7.6
TA - 50
CYA - 35

10000 gal vinyl, liquid chlorine

The test tolerance is +\- 0.5ppm (one drop) so it’s not surprising/totally normal. But remember that your CYA is either 30 or 40, no inbetweenies. So keep it chlorinated appropriately.

 

[Newdude]

I've noticed this week that my FC isn't moving and I don't want to run into the same problem.

Why are you so eager for it to come down from 6 ? With a 40 CYA (always round up) target is 5 to 7 and you're safe and harmless all the way to 16. Unless you're algae, but I'll go out on a limb here and guess you're not.

 

[YippeeSkippy]

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