Whom would you trust?

[SalemCastles]

Hi Ben,

What are you considering as High CYA? Any concerns over the toxicity of CYA?

[waterbear]

Hi Ben,

What are you considering as High CYA? Any concerns over the toxicity of CYA?

Cyanuric acid is essentially non toxic with and LD50 of 7700 mg/kg in rats. For comparison purposes baking soda (sodium bicarbonate) has an LD50 of 4220 mg/kg, table salt (sodium chloride) has an LD50 of 3000 mg/kg, Aspirin 200 mg/kg, and caffeine 192mg/kg.
This means that baking soda, table salt, Asprirn, and caffeine are progressively more toxic than CYA!

[SalemCastles]

That's good to know ...I've been called a Rat a few times.

[PoolDoc]

That's good to know ...I've been called a Rat a few times.

[CarlD]

I agree with Ben about the numbers. Here's what I saw:
Variation in the FC/TC did bounce around a bit but in EVERY test FC=TC meaning there's no CC. The difference wasn't very great either...3 to 4. No biggie.

All but one of the pH tests were within a couple of tenths--7.5, 7.6, 7.9. The 7.9 is almost an outlier but it's still not far away.

Alkalinity is also really, really close...basically the same.

The one difference was CYA being 40 in one and 55 in another--and we see such wild swings all the time. My view on CYA is I do it exactly the same way every time and use THAT as my baseline. And I always run the test twice, at least. Just pour the mix back into the squeeze bottle and then squirt it into the black dot vial again.

Since I have rarely any trouble over the summer, I'm likely to stick with what works for me. Sometimes high CYA/High FC running is necessary....ask aylad!...but running at 30-50 CYA has been effective for me. Poconos and I live much further north than aylad or PoolDoc, or even Watermom and pools do behave somewhat differently up here than they do in the South. Adaptability, though is key.

Carl