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There are a few places on the bottom of my pool that seem to grow a "black" algae, even during periods when I keep FC constantly above 4.0 (CYA is 62). Brushing these spots doesn't dislodge any of the algae (unlike the "green" algae I used to get before I drained my pool, which would send up a...

I have a 355 gal hot tub, and as a result of CC creeping up to 0.5 - 0.6, I've decided to shock the spa. My CYA is 35, and consulting the Cl/CYA chart, I see I need an FC level of 14 ppm. To be safe, I raise FC to 16, and test again later in the day. FC has dropped to 12 or so. I raise it...

This year, I made the switch from tri/dichlor to liquid chlorine, in both my pool and spa, and have been rewarded with constant CYA levels, which is very pleasing. However, I have been having to deal with a new problem, especially in my spa: pH drifting upward. I have a 355 gal spa, and every...

I wonder if someone can clarify the statement made in "ABCs of Pool Water Chemistry" under The Pool School that "Solid stabilizer can take up to a week to fully register on the test, so don't retest your CYA level for a week after adding some." Does that mean that the stabilizer is not...

Dr. Andrew Weil, one of America's most preeminent doctors and public-health spokespeople, ends his most recent online newsletter with the claim, "Chlorine-based disinfection of swimming pools is obsolete." See http://www.drweil.com/drw/u/QAA361110/dangers-of-chlorine.html In response to a...

My pool (see signature) is 6.5 years old and has never been drained. For most of its life, I've maintained chlorine levels using trichlor tabs in the skimmer and broadcast dichlor to shock. Recently, it's been harder to maintain adequate levels, and I've had problems keeping algae away...