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    Hayward AquaPlus Upgrade for More Relays

    Other than the front panel not fitting right, can an AquaPlus system be upgraded to a PS8 to add some relays by just replacing the P4 Local Control with a PS8 Local Control and getting a relay kit?
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    Polaris Watermatic C2000 ORP/PHG Controller with Spa

    We are adding a C2000 controller to my year-round spa in Chicago. I am a little concerned that the flow cell & sensors could still freeze during a real cold spell. The low speed pump on my spa runs between 6 and 8 hours a day depending on temperature. Any thoughts on how to insulate the flow...
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    Chlorine Demand

    I have a chlorine demand problem and had a Bioguard demand test done. Of course, test indicated that I need 22 lbs of Burnout 35 to break the demand. Burnout 35 is is Lithium Hypochlorite and about $8 a lb. If I do my calculations right, about 8 gallons of 12.5% liquid chlorine, 11 lbs of 73%...