Hi Everybody, Just bought my first house with a 20x40 vinyl liner inground pool (~31k gallons -per the guy at the pool store) and they tell me I have "Chlorine Demand." Their advice was that I buy 30-40 lbs of shock to fix it.
Free cl: 0.0
Total cl: 1.5
Total Alkilinity: 105
Total Adjusted Alkalinity: 96
Water Temp 80f
I was trying to go BBB, after reading pool school, and several other articles on this site (including this gem: turning-your-green-swamp-back-into-a-sparkling-oasis-t4147.html). I thought that to break the chlorine demand I needed to "Shock" 10x the combined chlorine. I added 10 182 oz jugs of 6% clorox last night to try and accomplish this (per the pool calculator, this should've been able to service a CC of 2.5 ppm...), but this morning my FAC was back to zero... I've been skimming a lot of gross looking junk off the top though, and my sand filter seems to get blocked up after running for about 90 minutes (so I backwash until the sightglass is clearish)... Am I heading in the right direction, or do I need to do something differnt? Thanks for your help.
31k gallon inground vinyl liner; 1.5 HP Hayward SP; 24 inch american pool products steel sand filter; taylor k-2006 test kit; one frustrated wife