I keep these chemicals handy:
- Liquid Chlorine (even though I have SWGs, I keep some LC around just in case)
- Muriatic Acid (I keep 4-8 gallons of this handy, because like you, TONS of water features)
- CYA (I keep 4-8 pounds of this handy, just in case I need to bump CYA, which is very rarely)
- Calcium Chloride (I keep 20 pounds or so around, just in case I need to bump CH, which is very rarely)
I -never- have to keep chemicals that raise pH or raise TA, like baking soda of soda ash, because mine constantly go higher on their on (aeration, and my fill water TA is 300+).
You will eventually learn on your own what chemicals you need to keep handy based on YOUR pool and your pool's inherent chemistry. After awhile, you will see patterns, again and again and again. Just like I do with needing 2-3 gallons of MA -each week- to keep my pH in check (TA around 70-100) because of my water features.
We can discuss other things that you might help to have around, like the proper cleaning tools for your filter (you need a Filter Flosser from Amazon, OMG it's the
best thing I ever bought to help me clean my two cartridge filters), and nets, and a good, right sized, telescopic pole (Dang is it a zillion times better (IMHO) than the CHEAPIE poles ---
https://www.amazon.com/dp/B0B1FB4K5C?ref=ppx_yo2ov_dt_b_product_details&th=1) . etc.