Hey Hot Tub Owners! Can’t get your hot tub to heat up? The problem might not be the heater. It could actually be your filter. Low water flow can cause your heater to stop working properly. And low flow can be caused by a dirty filter. So before calling in a professional, remove and clean your filter to rule out a flow rate problem. Then, make sure the water level in your hot tub is high enough. Finally, make sure there are no closed valves and there’s nothing blocking your drain covers. Hopefull