During the Summer months I plan not to use the heater in my swim spa. Here in the south the heat (weather) will keep it plenty warm and During that time I'd rather use it as a plunge pool. My question is do I need to keep it covered 24-7 like I would in the winter(cooler months)time? I know that leaving uncovered would make it subject to debris and critters, rain etc. Unlike other times of the year I'm not concerned (?) with keeping the heat in or water evaporation but I don't want harm the spa. I really appreciate and advice on this idea(I hope not a bad one) of mine! Thanks much!