Like so many of us my father became a pool owner when he bought his house and received the instructions to: Turn this, pull that and flip this switch to backwash...put them back where they were to run the filter.
We got to talking about whether he filters his pool from the skimmers only or skimmers & drain. He says he thinks the drain does not pull anything into it. Dirt settles on the bottom of the pool as well. The picture below shows his pool pump and filter setup for his in-ground pool. He has two skimmers and one drain. No water features.
Any experts help us understand his system better?
What I think I know (and what I know I don't):
#1: Water comes in from pool main drain (because it is written on there)
#2: Water comes in from skimmers
#3: 2-way valve* (he turns this when backwashing pool...so is that when his drain is actually moving water?)
#4: Water out from Polaris pump.
#5: Pool pump.
#8: Push pull main valve used for backwash & filter positions
#10: Water out to pool
#11: Backwash water pipe
#12: 2-way valve* (he never turns this)
* 2-way valve? Are they also capable of being 'half-way' turned to let water come in or go out to both pipes?
I appreciate the help!