If you are set on getting this pool then a generator is out.
If this is your first pool, you can start by using bleach or Liquid Chlorine and seeing if testing and adding as you need is easy enough for you. I find it's not a burden. If you learn our B-B-B system, which is very easy, you may find the SWCG isn't necessary. I would LOVE to have one but I cannot justify the cost (for me) because it relieves me of very little work. OTOH, I was EASILY able to justify a robotic vacuum rather than manually vacuuming and brushing the walls.

But that is me, and my needs.

I don't know about the Liquidator but I tried an earlier passive system that used pump suction, replacing the drain plug on the pump. It was, for me, a total waste of $$$ and that on-line store stopped selling them. From what little I hear, the Liquidator is better.

Also if you haven't done so, invest in a good test kit. We recommend the Taylor K-2006 or K-2006C. PoolDoc and Watermom have links to them on their signatures and if you use the link there's a small commission paid by the store that helps pay to maintain the forum.

Carl