Heating pool with excess AC heat
You do not want to run water over your coils, this will cause any hard water deposits to build up quickly and even if the aluminum fins are coated to protect from salt air this layer will be destroyed in a short time by flowing water over the coils. I agree with @jimmy fix-it , a separate system would be better. I have several rolls of black drip irrigation tube on the roof of my arena , any roof would work, we had to shut it off for a few days already because when the water temps get into the 80’s it’s not refreshing at. Don’t cut the service life of your expensive condenser &amp; compressor unit short.