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Thanks, fixed the TC -> FC typo! For FC/TC/CC I had this section already but I added one paragraph to specifically call out possibility that FC can be 0 in FC+CC=TC: Free Chlorine (FC) vs. Total Chlorine (TC) For Calcium Hardness I never found any useful test at all; I mention that here in...

Well, just to provide some closure for this old thread: although I was tempted to, I never opened up the filter to check the sand because I was afraid something else would break in the process and the problem was not quite bad enough to justify more drama with a pool I don't own! The sediment...

Thanks to COVID I was "stuck" in Hoi An, Viet Nam for 20 months (good place to be stuck), and as the only tenant in a 6-apartment building (a typical scene as tourism is decimated across Vietnam, Thailand, and all of South-East Asia) I took on the role of maintaining (and enjoying) its pool...

Haha, yes, like no labels. In the whole town (which is a tourist town so has hundreds/thousands of pools) there are only two pool suppliers who operate out of small rickety shops and generally deliver whatever you order in a thin, unmarked plastic bag or (for acid and stuff) an unmarked...

I just looked at the pressure again and nowadays it's 1 PSI normally and 0.5 PSI just after a backwash. Is that at all reasonable? Everyone else seems to talk about pressures an order of magnitude bigger. Today, poking around the landlord's pool cabinets, next to their supply of soda ash, I...

That's a depressing and very good point, thanks! If none of the other methods work, I could get a few more tarps and totally cover the pool (well, leave the existing 1 foot stripe for sun but otherwise cover the pool. This pool has only a few users, so it can be covered most of the time.

Yup, it's a nice exile! COVID handling has been very good here so far too. Thanks for the great tips! See below... OK. Is there something that can predict how much chlorine I will need after getting CYA to 30? I am a bit concerned that the increased need for chlorine might lead to calcium...

Appreciated! And thanks for the incredibly useful reply/info. See below... You guessed correctly---I looked all over for either liquid chlorine or household bleach without "flavors" (yes they really call it that on the label) but came up empty. There might be an industrial sodium...

Hi all and thanks in advance for helpful advice. Thanks to COVID I am "stuck" in Hoi An, Viet Nam (good place to be stuck) and as the only tenant in a 6-apartment building (a typical scene as tourism is decimated here) I have taken on the role of maintaining (and enjoying) its pool. Thanks to...