Quote Originally Posted by Jodester View Post
Oh, no, my water level isn't dropping while the system is on. It's just that once the filter pump shuts off, water stops pumping into the spa (which is what creates the waterfall), and then the water in the spa "seeks its own level" with the pool. I was told by the pool company that this is normal. Is that wrong?
You should have a check valve plumbed into the spa return so the water in the spa does not drop when the spa is off. They might have left it out but it's pretty standard in spillover spa setups. It's not an expensive item so it's normally included. See if you have one and if you do see if it's operating properly. The Jandy and Pentair ones are pretty easy to repair. Just unscrew the screws and take the broken guts out and replace it with the working guts from a new valve of the same kind. It's actually usually cheaper than getting the rebuild parts! IF you don't have a check valve I would consider adding one.

BTW, you're probably right about not having a big chlorine demand right now. I'm on Long Island, NY, and the weather is turning cool as well as having some cloudy, rainy days. We keep our pool open into October because we use the spa at night in cool weather, but we'll be closing it fairly soon. We did have warm weather the past two weekends, heated the pool, and did swim all day, though. Our pool temp had been up to about 90 last weekend; now it's down to about 65. Cooler water and less sun means less chlorine demand, right?
That is correct!