Here are my specs. 10,000 gallon pool, 1,200 gallon raised spa, built 2006, Hayward Mega Plus 700 cartridge filter, Hayward Northstar SP4015NS 1.5hp pump, Hayward Super II 2.5hp spa pump w/blower, Jandy AquaLink RS, SpaLink RS controller, A&A Quik Leveler, Quik Clean In-floor cleaning/leaf vac, Laars LX 400 heater.
I am not sold on variable speed.
