Hi, Pam,

1. You need to reduce your pH....pretty quickly. Get it down in the 7.2 - 7.4 range

2. You indicate your Cl is holding @ 15ppm. I'm not sure what you mean. Do you have a set of current test results? Post them up if you do. Cl will clear up any algae issues and that sure looks like algae.

Post those test results and let us know the last time you added Cl and how much you added.

Folks here will help get your pool sparkling.

PS - also let us know how much CYA you have added. (total)