PoolMath says to use 3 gallons of 12.5% liquid pool shock for a SLAM, but the SLAM check list says I'll need at least 15 gallons or more for a 30,000 gallon pool. No FC showing, PH at 7.1, TA at 90, CYA at 30. Water is clean, but green; can't see the main drain, but bottom easily visible in shallow end. How to procede? Thanks. HarrisonJ
Water Chemistry
- Thread starter HarrisonJ
- Start date
The 3 gallons is just to start the SLAM. SLAM is an ongoing process that will take some time depending on how bad the water is. There’s no definitive way to know if it’ll take 5 gallons total or 15 gallons total. Don’t buy too much because it doesn’t last forever even when stored in a cool place.
- Jun 24, 2021
- 17,132
- Pool Size
- 29000
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-60 Plus
The 15 gallons is to purchase. After you add the 3 gallons to get to slam level, algae will consume some of that FC. After a couple hours and you test FC again, you will have to add more to get back to SLAM level FC. It is a process of testing and replacing FC to slam level multiple times until you meet the exit criteria.
After slam, if you have some left, you can use it for daily chlorination or take it back.
After slam, if you have some left, you can use it for daily chlorination or take it back.
Your pool will go through the better part of a gallon per day once it warms up with 30k gallons. I wouldn't worry about buying too many.