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New question I understand that when raising the FC to shock, that I need to bring the FC up to 23 until it maintains 23 overnight. I did that last night - BUT, for some reason, the FC went up to 26 last night and dropped to 23 this morning. Question is: Is an FC of 23 some magic limit (it...

Thank you all for your help - you're awesome! Heinz

I will be holding the FC at 23 (with a CYA of 90)... until it stays there overnight - having said that... Will be unsafe for people to use the pool during that time - or just a chemical irritant due to the high FC? If it is unsafe, when will I be able to safely let people back into the water ?

How long to hold high FC for shock? Oops, forgot about the pH level - it is out there at 8.2. I added the Muratic Acid this morning - tested one hour later and pH was 7.4... will test periodically as I drive it down to 7.0-7.4. Added bleach and FC is up to 15.5 (CC still 0) - will continue to...

I am renting a house close to Sacramento CA that comes with an outdoor pool – this will be my first attempt at maintaining one. It is a 10,000 gallon, in-ground, masonry pool, with cartridge filter, small water fall (currently hardly-ever used), and no other additional equipment. I cleaned...