Plaster Sand in Robot Bag

[RedMartinez]

Replastered my 26000 gallon pool in 2005. Beginning this year, I am finding sand like material the same color as the plaster. Pool chemistry is on target....CH 200, FAC 5, TAC 5, CYA 30, TA 90, ph 7.6, no metals, TDS 1000, Phosphates 50. Water is crystal clear.

Is this normal for a plaster of 13 years? Do I need to raise the CH? Thoughts, suggestions, advice, explanations appreciated.

BTW, first post on the site.

 

[bmoreswim]

The recommended level of CH for a plaster pool is 350-450. Also, a 13 year old plaster pool (plain plaster I suppose?) would certainly be prone to having some surface deterioration. But you should raise your CH up to the recommended level. A level of 200 for years would certainly shorten the life of plaster to some extent.