I have a 6600 gal fiberglass pool and a 300 gal spillover spa next to it. the both use the same pump, filter, heaterpump, salt generator, etc. I use an Aqualogic control system which allows me to have different pump run times for the pool and the spa and to have different temperatures and chlorine generaton levels in both automatically. When I want to change the water in the spa I just turn the spillover on. (Usually for about an hour after we have used the spa.) it has been in operation since Thanksgiving and never closed since it never got cold for more than a weeks time here in FL. So far there have been no problems! I used to have a stand alone spa and the water balancing and the need to be drained and refilled every few months was a real headache by comparison!
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