Quote Originally Posted by masssilverf150 View Post
Even before switching to salt i would get Green-like algae on the sides and bottom of the pool. I can scrub with a rag and filter/shock the pool and it goes away.
Since switching to Salt it appears the issue still occurs once the Free Chlorine level drops below 3.
Sounds like mustard algae; keep your chlorine ABOVE 3.0 100% of the time.

If you switch get a DPD-FAS testkit, so you can actually *measure* levels above 3, you can probably fine tune it more than that. (We call them 'guess'-strips for a reason!). Check out the test kit link in my signature if you are interested: get either the K2006 OR the K1515. And no, they aren't available locally.