FP here, be gentle. We bought a house with a nice pool and an in-ground spa. I've spent the last months untangling its mysteries, learning how to balance my water (thanks TFP!), and trying to sort out the equipment that's already set up.
The short version of this question: my in-ground spa spills over into the pool when the heater is on. I don't want to heat my whole pool every time I want to use my spa: the pool is something like 60,000 gallons. I'm trying to figure out whether I'm doing something wrong, or the setup is wrong. I suspect there may be some automated valves I need to be selecting, but I don't want to select wrong, and destroy my pumps. I have photos of my equipment to help us sort out what's going on here. I've attached those photos. You may want to look at them before reading the long description below.
Long version: the pool and the spa are adjacent and appear to share filtration. The pool is large, with two Hayward canister filters (one filter apparently tied to the spa.) There is a Hayward Aqualogic controller driving the whole system. The controller allows selection of "Pool" or "Spa" -- there is a "spillover" option, but it cannot be chosen. There are a number of 1-1.5 HP "primary" pumps:
* one pump connects to a filter, which connects to the heater, which connects to either the pool or the spa depending on what selections you make with the controller. The heater cannot be turned on unless the filter/ pump is also on.
* one pump drives a waterfall
* one pump drives jets on the in-ground spa
* one pump connects to a second filtration system on the opposite end of the pool (the pool is about 95 feet long, which I guess necessitates this second filter, though I hadn't been using the spa filter until today.)
There are also two 3/4 HP booster pumps:
* one drives a pressure-side Polaris 280 pool cleaner
* one is connected to nothing.
As I mentioned earlier, there are valve selectors in the controller (see controller photo) and I suspect one of them may control spillover on the spa. Or maybe not. It's just hard to believe someone would build a pool with a spa that would cost a mint to operate. As things stand now, I appear to have to heat my entire pool to be able to heat the spa.
A lot of detail, but hopefully it helps us get to the bottom of this. Any ideas out there?