no just topped off after the winter. I have been running it 24 hrs a day for 2 weeks water is very clear, but after first shock dirt appeared so I vac'ed and shocked again, white dust appeared where the dirt was. I have about 40 tablets, unwrapped. Pool store yesterday said cya was 90. Shock was cal hypo. Yes had small areas of algae that i vac'ed up prior to shocking. Borax has kept the ph level at 7.4 till I added bleach