I'm planning on draining my pool due to high CYA levels and had a few questions.
First, the waste output from my filter goes directly into the ground (and I assume is connected to the sewer system).
When I backwash the system, the pressure on the filter fluctuates wildly (0-20 continuously on the dial) and there are a lot of cavitation sounds. I'm wondering if the pump is trying to push water into the sewer system at too high of a rate or if that is simply normal.
While I could rent/buy a pump and hook it directly to the cleanout line, that seems like an expensive alternative if I can simply use the waste line to drain the pool.
I'd also like suggestions on draining it all in one shot (I need to drain at least 75% of water) versus doing partial drains/refills.