Recent content by hnkput

Update: It occurred to me that I should use the 0.2 ppm increment test rather than the 0.5. That more precise test yields FC = 8.2 ppm and CC = 0.2.

Did my last question/observations stump the forum? Regardless, I'm highly appreciative of the help. I think the diagnosis (mustard algae) was correct, as was the suggested treatment. And this helps address a problem that while minor, I've nonetheless been fighting for a long time. At present...

I use "Kemteck" bleach (is it OK to post brand names?). The ingredients are "Sodium hypochlorite 10%, Other ingredients 90%". I suppose the "other ingredients" are mostly H2O. I don't believe that the problem is NaClO concentration. That doesn't explain the systematic non-linearity: each...

Error in prior post. I'm not adding NaOH. I'm adding Na hypochlorite, or NaClO. I don't know how strong a base NaClO is.

I've discovered a non-linearity in the FAS-DPD test. The calculator on this site, and the dosage recommendations in the test kits both indicated that to get to ca. 24 ppm FC, I would need to add about 2.75 to 3 gal of 10% NaOH. But that dosage only got me to 16 (from about 2-3 ppm starting...

Thanks for the rapid reply. The algae doesn't clump but it is indeed slightly yellow, and has all the other characteristics noted. Let's say I successfully get rid of it. Can I then go back down to running at 7.5% CYA for a min FC? The 6.1 ppm FC min. in the Chlorine/CYA chart is > the 5 ppm...

Hi All, Water looks good - sparkly and clear. We're in Fresno (100+ deg. F. summer days). I've been lucky and have never had cloudy water or an algae bloom since the pool was installed (2010). But after the first year, I've had persistent staining of algae on the pool wall surfaces that are in...