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Thanks for confirming. My VPN was blocking access for some reason. Disconnected and was able to reach it. Thanks!

Anybody having problems getting to tftestkits.net? I've been trying since I received the notice for the sale on kit refills and haven't been able to get through. Weird.

The dark black circle is the shadow of my (empty) floating chlorine dispenser. No copper that I know of. About a year and a half ago I did an RO treatment on the pool water, and since then I've been adding only bleach, borax, and muriatic acid. There is an old pool heater we don't use that is...

Thanks. I'd like to take another scrape sample but the water is still pretty chilly. Maybe I'll rig up something on the end of the pole. Any thoughts as to what it might be?

Greetings! Long time lurker, first time poster. I have been following the TFP method for about a year and a half now, with no problems. Starting around last fall, after we stopped swimming for the season, I started noticing little black splotches in a couple of places in the shallow end. I...