ralph
08-21-2011, 03:14 PM
My pool is an in-ground 18500 gal with 3/4 HP pump(flow into pool ~40 gpm) and a sand filter. (Built in 1969 and have replaced liners several times). Been using the BBB method since Nov, 2010 and testing is done with TF-100 kit. Prior to that I used pucks, algaecide etc. When tested by pool company CYA was always around 50 and my evaporation rate was 3/8-1.2"
Currently evaporation rate is around 1/2" in 24 hrs or 160 gal/day. In 30 days will have replaced 4800 gals of fresh water= to 26% of total volume of pool. July 22, 2011 CYA had dropped to around 18. Purchased Instant conditioner and put in 52 oz per bottle instructions. Had to add 76 more oz before measurable increase to 30 overnight and 3 days later dropped to 25. My current reading (8/21/11) shows slightly less than 20.
I have been maintaining FC @ 2.5 to 3 but have a recurring slight green algae bloom every 2 weeks and have shocked to 60% CYA.
So a) do you think 26% water replacement enough to lower CYA 5-10 points? Do I face a monthly conditioner increase or go back to using pucks? and b) your thoughts on my inability to kill algae? My shock treatments took 3 days before the FC change is 0 overnight and my CC readings have been less than 0.2 consistently.
Hope the above is adequate for a reply.
ralph
Currently evaporation rate is around 1/2" in 24 hrs or 160 gal/day. In 30 days will have replaced 4800 gals of fresh water= to 26% of total volume of pool. July 22, 2011 CYA had dropped to around 18. Purchased Instant conditioner and put in 52 oz per bottle instructions. Had to add 76 more oz before measurable increase to 30 overnight and 3 days later dropped to 25. My current reading (8/21/11) shows slightly less than 20.
I have been maintaining FC @ 2.5 to 3 but have a recurring slight green algae bloom every 2 weeks and have shocked to 60% CYA.
So a) do you think 26% water replacement enough to lower CYA 5-10 points? Do I face a monthly conditioner increase or go back to using pucks? and b) your thoughts on my inability to kill algae? My shock treatments took 3 days before the FC change is 0 overnight and my CC readings have been less than 0.2 consistently.
Hope the above is adequate for a reply.
ralph