We have one type of pool/spa combination which is just perfect for us since 2005. T&D Concrete built it and we have nothing but praise for this company. The pool and spa are separate concrete structures, but they share the same water, filtration and heating systems (gas and solar). There is a 'spillover' from the spa to the pool which mixes the water and keeps everything at 82 degrees when you select the "pool mode" on the controller. If you switch to the "spa mode" the water stays just under the spillover level in the spa and heats to the desired temp (usually 101), quickly.
We find that with minimal maintenance, this system keeps everything clean, which is a big issue with a spa. It also is more energy efficient than some other designs because you can segregate and heat just the spa quickly.
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