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I note your advice about using liquid chlorine, which I presume is because it is unstabilised, and therefore does not contain CYA. Liquid Chlorine is not available from pool suppliers in Cyprus, except as household bleach from a supermarket, and I presume this would be not of a high eenough...

Thanks, very helpful.

Thanks for your comments above, sorry for delay, I have been away a few days. My pool is a fiberglass inground pool, 7m x 3.5m (23ft x 11.5ft), 25000 liters (6600 US gallons). My pump is "Calpeda" (Italian) with a 15m3 (15000liters or around 4000gallons)/hour capacity. The Chlorine pucks I use...

Since 2008, I have had a fiberglass inground pool, 7m x 3.5m (23ft x 11.5ft), 25000 liters (6600 US gallons). Until recently the only testing I do is what was supplied by the pool supplier, ie. oto for Chlorine and phenol red for pH. So far I have managed reasonably well. For Chlorine, I use...

I have a fiberglass inground pool, 7m x 3.5m (23ft x 11.5ft), 25000 liters (6600 US gallons). On starting up for the summer the pH was very low, so I over a few days I added a few kilos (several pounds) of Soda Ash (sodium carbonate) to raise the pH to the correct range. A few days later, purple...