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You should post some pictures so that we can confirm, but indeed what you describe is possible. Does the SWG have the option to be run from 240? If so the easiest option might be to switch the SWG to 240 operation and wire to both legs feeding the pump (assuming you can locate the other...

The big-box home improvement stores (Lowes, Home Depot) also stock liquid chlorine.

If you just pour it the skimmer the bulk of the granules will end up in your filter. If you have a cartridge filter that is just fine, but will probably take several days to fully dissolve there. If you a sand or DE Filter it will do the same as long as you don't backflush before it...

This is not uncommon, I see very similar difference in my own Jandy SWG. The SWG estimates the salt level from the conductivity of the water, and this just indicates that there are other compounds in the water contributing to the conductivity in addition to the salt. The good news is what...

I use a skimmer sock. I fit the sock in the skimmer and then add the CYA (typically 8 oz at a time). Leave the pump running and a few hours later it is gone.

Show us some pictures of your equipment pad. You should be able to fill the basket area up to the level of the inlet line, and the pump should prime fine with that. My system will siphon most of the water out of the pump if I open the basket. To avoid that I shut off the return entirely...

How cold is your water? The test will read falsely low with cold water.

If nothing else it would be very helpful if the log display could be filtered to a specific category. eg Just the maintenance items so I can see when I last cleaned the filter without scrolling through a years worth of FC and pH tests. or just CYA so I can see when I last added CYA, etc.

Note that drawing 5 is for 277 volt, not 240. For 277 volt there normally is a neutral leg.

Also how big is that "existing conduit". You will need at least 1-1/4" for your 3x #3 + 1x #4 (or #8).

I would stick with copper wire. While aluminum is might be a bit cheaper, it has to be done just right (and with the appropriate connectors) to be safe. I believe the ground run for for the 100A circuit can be #8, but certainly no harm in using #4. Double check that the sub-panel is rated for...

I would agree that X10 is not a good idea. I've had plenty of experience with it, and while it can be made to be reasonably reliable it can often take a lot of work and troubleshooting to make it so. FWIW I have never seen issues with X10 "going off on it's own" the typcal problem is that the...

Or Amazon.com

There are some non-wifi options as well, remote relays that work by signals sent over the power line or by radio signals from a dedicated remote control.

Most likely the check valve on the SPA return (box on the left pipe in your last picture) is leaking. It's not a style I've seen before but it looks like it should be serviceable.

As Jim said it is difficult to tell from your pictures what's going on. I will make a start but you will probably need to do some experimenting. The pipe at the back of the pad that I've labeled "Goes to Waste?" look like it probably runs to waste water somewhere can you follow it? If that is...

It does need to be installed in a location where it will always get flow if the pump is running, so that means you can't just cut out the existing chlorinator and put it there. The location of the check valve would be fine, and the fact that heater has union connections will make the task a lot...

I would love to see the engineer's explanation for why there are two bridge rectifiers and they are only using 1/2 of each. I could hazard a guess that they ran into heat dissipation limits on the part, but if that is the case surely it would cheaper to use a single larger part and/or a better...

You might investigate how the how the the Hot Tub behaves on a power loss, if it does not automatically restart then your are probably fine, as long as you know better than to turn it back on when on Generator power.

Depending on the lot layout you might consider locating the equipment at the back of the lot rather than the side yard, and perhaps enclosing it in some way. In our city the side-yard setback is 10' for equipment, but only 5' from the rear property line.

I have a 22kW unit de-rated to 19 kW because it's running off natual gas, and it has no problem running the entire household, including heat-pump heat/air conditioning and the pool pumps. It shares a 2" gas line with the pool heater and both happily run at the same time. I would have to try...

Indeed if it were mine I'd be very tempted to take it all apart and start over, starting with pouring a new concrete pad for everything. I don't see any obvious reason that the equipment is crowded so tightly together, would there be any issue if the layout extended and additional 2-3' to the...

Yes we have an auto-cover and yes I would do it the same way again. The cover quickly and easily covers both bodies of water.

On our small pool the SPA is divided from the pool by a wall than only extends 1/2-3/4" above the normal water line, so yes when people enter the SPA it overflows into the pool and when they get out the SPA level is clearly lowered about an inch per person. Likewise any significant activity in...

I had RO treatment done on my SoCal pool done at the end of 2021 (high point of the drought and pool refilling ban). I believe it was the same trailer system as the link posted. Water used in the process was approximately 25% of the volume of the pool.

I've thought that Coverpools or the other auto-cover companies should investigate making an insulated cover material. What I'm thinking is two layers of the vinyl that they use now with a thin (1/16"?) layer of close-cell flexible foam between. The added thickness would consume a lot more...

Perhaps instead of a tarp put a piece (or 2 pieces) of polystyrene insulation board over the auto cover: https://www.lowes.com/pd/Common-1-5-in-x-4-ft-x-8-ft-Actual-1-4375-in-x-3-875-ft-x-7-875-ft-R-Expanded-Polystyrene-Foam-Board-Insulation/3362408

I'm guessing that's a waterfall feature of some sort on the left side of the pool as drawn? If so you will want to be sure you get the interlock feature for the pool cover so that the Aqualink knows if it is closed and will prevent the waterfall from running. I see only one skimmer. Which if...

Indeed I'll admit it's a pricey option. And you have to factor in replacing the cover every 8-10 years.