I turned a black swamp into a clear pool a few months back after completing a 40+ day SLAM.
At the time my CYA was 60. I have been maintaining FC of between 5-9 for the last few months. Pool has hardly been used in that time and i was averaging a loss of 3ppm (900ml liquid chlorine) FC in 24 hours.
A few days ago i noticed my pH had risen to 8.0 so i have been gradually reducing that down.
Just completed test results
FC 8
CC 0
pH 7.2
CH 280 (aim is to get this to around 350)
TA 80 (was 100 before i started reducing pH)
CYA 40 (did 5 tests and i average 35, i take it i round it up to 40?)
CSI -5.2 (Less than -0.6 is suggestive of problems for plaster, tile, stone, and pebble pools. - What do i need to do to reduce this?)
Questions,
*What is/are the reason for my CYA to drop? Have had a bit of rain last few weeks, which i understand could be the reason pH has increased but im not sure about the CYA?
*Since dropping my pH i have noticed my FC usage has decrease over 24 hours. Is this normal?
* Am i correct in thinking as i have been targeting FC of 9 when (as linked to CYA of 40) it should have been FC of 7 that this could be the reason why more FC was being used?
*So to maintain, min FC is 3, target is 5-7. Do I start with the new figures from now or should i increase CYA? (i have some pucks which the previous owners left behind).
At the time my CYA was 60. I have been maintaining FC of between 5-9 for the last few months. Pool has hardly been used in that time and i was averaging a loss of 3ppm (900ml liquid chlorine) FC in 24 hours.
A few days ago i noticed my pH had risen to 8.0 so i have been gradually reducing that down.
Just completed test results
FC 8
CC 0
pH 7.2
CH 280 (aim is to get this to around 350)
TA 80 (was 100 before i started reducing pH)
CYA 40 (did 5 tests and i average 35, i take it i round it up to 40?)
CSI -5.2 (Less than -0.6 is suggestive of problems for plaster, tile, stone, and pebble pools. - What do i need to do to reduce this?)
Questions,
*What is/are the reason for my CYA to drop? Have had a bit of rain last few weeks, which i understand could be the reason pH has increased but im not sure about the CYA?
*Since dropping my pH i have noticed my FC usage has decrease over 24 hours. Is this normal?
* Am i correct in thinking as i have been targeting FC of 9 when (as linked to CYA of 40) it should have been FC of 7 that this could be the reason why more FC was being used?
*So to maintain, min FC is 3, target is 5-7. Do I start with the new figures from now or should i increase CYA? (i have some pucks which the previous owners left behind).