Quote Originally Posted by Piney View Post
Its much better, but I do see it start to come back if the CL levels drop. We've been trying to keep them above 4, and if we're going out of town, raise them up to 6-8 or so.
Piney,

What's your CYA level? I just want to see if the rule of needing an FC of 15% of the CYA level for preventing yellow/mustard algae applies to your pool (the rule for green algae is a minimum FC of around 7.5% of the CYA level). That would imply a CYA level of about 25-30 ppm for your pool. If you have a higher CYA, then your yellow/mustard algae isn't as aggressive as in some other pools, possibly due to limited nutrients or environmental conditions.

Richard