The switch has a locking feature. I believe reaching under the switch and moving a piece of plastic unlocks it, then rotate the dial and test until it works correctly. Once you have the best setting, lock the switch and replace the cover.
I have a Raypak 5450 heat Pump for my above-ground pool and using a Harris 1.5 HP above-ground swimming pool pump. The system works great except it doesn't appear as if the Raypak has a water pressure switch or a water flow switch or is not adjusted properly, so when my pump isn't running the...
I elected to use 1.5" to 4" river rock. I placed the larger rocks around the perimeter of the pool to prevent the smaller rocks from getting under the liner.