Don't "strain" to see it. Hold the tube at waist level, back to the sun, just glance into the tube, then look awayand glance at the tube again. If you can see the dot at 50 and can't see it at 40, use 50 foryour CYA reading... always round CYA up.
You are correct - you need to test often (every few hours is ideal, minimum 2-3 times daily) and bring the FC back up to level when you do. You do it until there’s no sign of algae at all, pass OCLT, CC at 0.5 or less.I am now wondering if we did a proper SLAM the first time around. We brought it to shock level and the pump ran continuously for 2 days. Water cleared up. Did not test until the water cleared out. Passed OCLT.
Should we be testing a few hours after bringing to shock level and bring it up shock level again? How long should we keep it at shock level now, given that the pool is clear?
Thank you. Should I let chlorine levels drift down?If you have no debris build up in the pool, you can return your pump to its normal schedule.
Clean your chlorine testing vial with bleach or rubbing alcohol. We have found that persistent CC can be traced to dirty testing vials.