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We’ve recently upgraded pumps, controls and automation for our 1,000 gallon in-ground spa, and the next item on the list is a new light to replace the 20-year old incandescent unit. This fixture, long inoperative, was originally wired to an X10 dimmer switch that was removed when we installed...

I'm trying to determine the optimal settings for both economy and effective filtration with my variable-speed pump. My sand filter specs show: filtration area of 1.92 sq. ft. filtration gpm/sq. ft. = 20 gpm filtration flow rate of 38 gpm (i.e., 20 x 1.92) Questions: Should I consider 38...

Hello, everyone-- We have a 1,000 gallon in-ground spa, lined with tile, about 20-years old with recently upgraded pumps, controls and heater. I had been mainly using 1" trichlor, with a drain-and-refill every one to two years. Having read through much of Pool School over the last week I'm...