I'd say the algae is green, so I guess its not dead. I'll keep going with the chlorine and try to keep it at 15 or above.

I do have a pressure guage but I kind of question if its working properly. It never seems to change. It is always around 19 or 20 psi and never seems to go up. I'm pretty sure it does go down to zero if I turn off my pump.

I'm not sure what DE powder is, but I'll look it up in the abbreviations and figure it out.

Thanks