Sunday, 18 April 2021

First Time Opening, New plaster last season: scaling and sharp crystals

Hi,
We just opened yesterday and I'm sad to say that the previously china-like surface of my new plaster is covered with deposits of sharp crystals. After running overnight, the sweeper was full of crystals as well. Running my hand over it, it feels like a very coarse sand paper. Calcium carbonate, right?

The pH is very high, I don't know how high yet because it's off the top of my testing kit's scale (8.6).

Full numbers (before adding chemicals)
FC 1.5
TA 80
CYA 25
pH > 8.6
CH 300
CSI...

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