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    Retrofit eco-pump to replace ZTS100?

    My old ZTS100 seems to be losing its bearings and is squealing a fair bit. I've cleaned it out and tried to lubricate but it's still noisy. So I'm contemplating replacing it, and also going for an Eco pump. Problem is, it's not easy to find out exactly which Eco pumps can be swapped without...
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    Why does my pool shop think calcium is not important for me?

    I have my own DPD-FAS kit to measure my own pH, Cl and sometimes TA levels. Once or twice a month I go to my local pool store so they can measure my Salt and CYA levels (too cheap to get my own test gear for these probably). Pool is pebblecrete (the pool store system knows this). This pool...