Hi i have a plaster infinity pool in greece and its finished with Sika enduit piscine plaster lime based paint. The pool is filled with rainwater and the ph is about 7 which is normal but the paint gives off white dust ..its not stable. My idea is the acid rainwater is leaching the lime out of the paint which creates a good PH but a dust filled pool and obviously the paintwork gets thinner.Anybody think this may be correct or any other theories and ways to deal with it gratefully received . cheers martin