- Jun 22, 2014
- 52,051
- Pool Size
- 17888
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool RJ-45 Plus
You can do the OCLT at any time. You're not officially doing a SLAM yet anyways, but by performing the OCLT, you confirm there are no unusually high levels of organics eating your chlorine (FC). As long as you lose no more than 1 ppm of FC overnight as outline on the TFP Pool School - Perform the Overnight FC Loss Test (OCLT) page, then algae is not an issue. If you fail, then you need to SLAM.