Measure from the sump floor to the water surface in the skimmer's section, with the return pump running. Your skimmer's manual says how deep the water around it should be (often 6–9"). We set the legs so it stands in that.

Built sturdy: 1/4" acrylic on 4 support legs, placed so the platform stays flat under your skimmer. Soft TPU feet grip the sump floor, stop the stand rattling and won't scratch the sump.