I figured this was the most logical place for this post. Appologies if I guessed wrong. <grin> So on advise I've gotten here on TFP, I'm going to attempt to do a partial drain of my in-ground pool to lower my CYA levels. The issue I'm concerned about is how to do it correctly given my current plumbing config. The pool was built long before we moved in - built around 2005 I think. It has a skimmer on either end (shallow and deep end) and it has a pool cleaner port on the side. It's plumbed to switch only between skimmer and cleaner. There is no valve or position that I can see that allows for pulling water from a drain at the bottom of the pool. The way I see it, it's a simple work around to set the valve to pool cleaner only and as long as the pool cleaner is at the bottom of the pool, I'm pulling water only from that device and nowhere else. Does that sound about right? I have an auto-filler which I've shut shut off the valve for. I'm only going to drain off about half the water. Here are a couple images of the setup for what it's worth.