Last year upon advise from my local pool store I closed my 13 year old Vinyl, 22,000 gallon pool using...
1 Quart Orenda (CV-700 PHOSPHATE REMOVER & CATALYTIC ENZYME) and
30% algaecide instead of shock, etc. Total of $40.00. No other chemicals like I have for the prior years.
The pool was clear (closed Nov through May) when opening but, before I did this again, I wanted to get some expert thoughts on this method? Despite it working it seems strange and I couldn't find much online regarding this method.
Not sure if the clearness was due to the CV-700 and/or combination of the winter weather (Ohio).
Pool Store says this is what they use when closing.