- Nov 10, 2020
- 12
- Pool Size
- 37500
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
Hi All,
New Pool owner in Australia, about 4 months old (37000L, fibreglass, SWG). I've suspected a faulty SWG for a while as I haven't been able to get FC consistently over 1ppm pretty much since handover, but wanted to make sure my chemistry was sweet before going back to pool company.
Found out from a pool shop test that I had <10 CYA after about 6 weeks (handover guys only put in about 500g from what was left in the bag, and so added 1.2kg CYA and then some shock. 4 weeks later, no CYA again, and pool shop guy was stumped.
Since then, very little to no FC in pool, although it has been crystal clear with regular brushing and vacuuming (apart from the recent storms).
Decided to take matters into my own hands, and have been doing LOTS of reading over this site......
OCLT last night showed a drop from 9.5ppm to 6 (after manually dosing to get to 9.5), so started SLAM this morning. CYA is at 70, SLAM FC should be 28. Have been brushing and testing every 1.5 to two hours since 6am and adding relevant amounts of liquid chlorine to bring up to 28 (as per PoolMath app). On average, was losing around 3-4ppm between tests with <0.5 or 0 CC on every test. I have assumed that losses at higher FC's are proportional to some degree, and with extreme UV today, losses would compound - correct my assumptions if necessary.
At 6pm today (still very light - daylight savings) I vacuumed and changed cartridge, then tested and added chlorine to 28ppm. At 8.30, FC was still at 27 - I am aware tests are not overly accurate at these levels, but added another small dose anyway.
Plan from here is to leave everything as is overnight, retest in the morning, and if I haven't got a huge loss (less than 2 or 3 say - is this Ok at these levels?), let the day take its course. I figure that with a lower FC level tomorrow evening, I can get a more accurate picture of what an OCLT shows tomorrow night. As mentioned, water is absolutely crystal clear.
Does the plan seem sound at this point???
All going well, and I pass OCLT, when do I switch the SWG back on? At a certain FC???
Sorry, long post. I think I am well on track, just trying to sort out a few minor things. Appreciate any feedback.
And thanks for the site and forum - huge help!!!!!!!!
Cheers,
Mark
New Pool owner in Australia, about 4 months old (37000L, fibreglass, SWG). I've suspected a faulty SWG for a while as I haven't been able to get FC consistently over 1ppm pretty much since handover, but wanted to make sure my chemistry was sweet before going back to pool company.
Found out from a pool shop test that I had <10 CYA after about 6 weeks (handover guys only put in about 500g from what was left in the bag, and so added 1.2kg CYA and then some shock. 4 weeks later, no CYA again, and pool shop guy was stumped.
Since then, very little to no FC in pool, although it has been crystal clear with regular brushing and vacuuming (apart from the recent storms).
Decided to take matters into my own hands, and have been doing LOTS of reading over this site......
OCLT last night showed a drop from 9.5ppm to 6 (after manually dosing to get to 9.5), so started SLAM this morning. CYA is at 70, SLAM FC should be 28. Have been brushing and testing every 1.5 to two hours since 6am and adding relevant amounts of liquid chlorine to bring up to 28 (as per PoolMath app). On average, was losing around 3-4ppm between tests with <0.5 or 0 CC on every test. I have assumed that losses at higher FC's are proportional to some degree, and with extreme UV today, losses would compound - correct my assumptions if necessary.
At 6pm today (still very light - daylight savings) I vacuumed and changed cartridge, then tested and added chlorine to 28ppm. At 8.30, FC was still at 27 - I am aware tests are not overly accurate at these levels, but added another small dose anyway.
Plan from here is to leave everything as is overnight, retest in the morning, and if I haven't got a huge loss (less than 2 or 3 say - is this Ok at these levels?), let the day take its course. I figure that with a lower FC level tomorrow evening, I can get a more accurate picture of what an OCLT shows tomorrow night. As mentioned, water is absolutely crystal clear.
Does the plan seem sound at this point???
All going well, and I pass OCLT, when do I switch the SWG back on? At a certain FC???
Sorry, long post. I think I am well on track, just trying to sort out a few minor things. Appreciate any feedback.
And thanks for the site and forum - huge help!!!!!!!!
Cheers,
Mark