Lookin good! my take on the old slab, if it is as bad as it sounds, it should have been ripped out and poured at the same time. I understand time/money constraints so save up and do it right! You'll be a lot happier.
Much better! I thought my eyes were going for a minute.
I would clamp that hose to a joist a few feet from the filter, just in case someone gives it a good yank/trips on it etc.
You have a lot of sellable stuff in there if you want to spend the time. With the collapsed economy, China is no longer buying up our scrap metal so the bottom fell out of that.