Day 12: The pool's chlorine consumption has drastically decreased, only losing .5ppm overnight!! I'm hoping we (the pool & I) have turned a corner in this battle

As you can see from the pics.... still green, but much lighter than 2 weeks ago! Day 12 pics:
So, I have a few questions today. I'm thinking that circulation may not be ideal in my pool. There is no drain in the bottom

just a skimmer in the side wall. At the bottom of the skimmer there are 2 holes, but only one is sucking in water. Is this how it is supposed to be & what is the second hole??
Also, can I run the booster pump without the polaris attached to improve circulation? It makes a lot of noise with nothing attached & is whisper quiet with polaris attcahed. Booster pump is new last summer.
Next... I have 3 built in stairs at the shallow end with 2 return jets at the base that are not blowing out water. Do I turn them on with this??? (On top of stairs)
Or this??? (In front of filter/pump)
Thanks so much everyone :bowdown: With your help, I am setting myself up for an enjoyable future with a TROUBLE FREE POOL
