I have two equipment pads, heater on one, filter and pump on the other. These are precast pads used when the pool was installed in 2005. Noticed this spring that the pad for the filter has sunk almost a 1/2". Given the heater and plumbing coming out of the ground hasn't presented a problem. Using a 12" x 24" x 1/4" steel plate for the pump, anchored the plate with threaded concrete studs. Allows for height adjustment of the pump with nuts on the studs. Thinking of using 24" of flex PVC in line running from the filter to the heater.