This is a rental pool, which limits my ability to fine-tune and check things on a regular basis. It's not in the best of shape, and I've always had challenges with algae. I can't seem to put enough chlorine in the pool. I have two floats on the surface with tri-chlor tabs, and I have my tenant add 1 gallon of regular laundry bleach every night, yet when I come out every week to test it, it always registers 0 chlorine. The CYA is very high, though I use Pool Perfect with Phosfree, so there are no phosphates. When I take a sample to the pool store to have tested, they say all is normal other than no chlorine and high conditioner.
With the drought in California, I can't drain the pool, especially in the summer. I'd appreciate your recommendations. I'm reluctant to repaint or replaster the pool, as the tenants are inconsistent in caring for the pool. "The Pool Cleaner" does a good job of cleaning any debris (other than algae) off the bottom, and the water is fairly clear.
I'm attaching some old pictures of the pool, so you can see what I am dealing with. I removed the eucalyptus trees that dropped all the debris and added the pool cleaner, so there is no longer constant debris on the surface of the pool.