Hi.
I put in what I thought would be ballpark, knowing the chlorine level would quickly drop. And it did, as expected, giving me a starting overnight CLT.
Today, I am monitoring and adding chlorine as needed to maintain 24ppm. After adding 2 gals this morning, I tested moments ago - 23ppm. The procedure says not to test too often, so I'll go back in a few hours, check again, and add more chlorine as needed.
The procedure says:
It is best to use bleach or liquid chlorine when SLAMing. You will want to have enough on hand to raise the FC level to shock level at least a couple of times. It is especially important to avoid using dichlor when SLAMing, as it will raise CYA far too quickly.
- Test the FC level and add enough chlorine to bring FC up to shock level (see here for correct shock level)
Test and adjust chlorine levels as frequently as practical, but not more than once per hour, and not less than twice a day. Chlorine additions should be frequent, especially at the beginning. Algae and other organic debris will consume chlorine very rapidly at first. As things progress, you will lose less chlorine each cycle and can add chlorine less frequently.
- Brush and vacuum the entire pool once a day
- Backwash or clean the filter as needed
- Vacuum up debris as needed
Now as the murkiness is clearing and I'm starting to see the debris, I'll be able to vacuum it.
Poolmath says I needed only 3 gallons to go from 0-24ppm, so yes, it looks like I might have wasted some chlorine (about $6). If I ever have to do this again (I hope not!), I'll know better.