Response to Yes the 1 HP pump would be sufficient for this sand filter containing 150 lbs of sand. The filter would not work the pump, actually when you go higher on the HP of the pump you risk the chance of overworking the pump. For example this filter has a designed flow rate of 35 GPM and if the 1 HP is outputting 35 GPM then you are fine however if the 1.5 HP pump is outputting 50 GPM then then you get back pressure on the pump which is trying to put 50 GPM of water through a filter that can only handle 35 GPM.

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