My 13-year old, in-ground pool has two motors. One is a two-speed that drives the cleaning system. The other is a single-speed that drives a waterfall. The original pool equipment install included two, separate, small (2 ft. by 3 ft.), pre-made slabs of concrete. I'd estimate each slab is about 2 or 3 inches thick. On one slab is only the base of the two-speed motor. On the other slab sits the base of the one-speed motor and the base of the cartridge filter. The base of each pump is screwed into each piece of concrete. At the time of the original install, these small concrete slabs were just hand carried to the pool equipment area and placed on the dirt under the pumps.
Both of these slabs are starting to crack up and deteriorate. The slab under the two-speed pump now has exposed rebar and numerous cracks. The slab under the one-speed pump and filter is in better shape but still looks pretty cracked up.
How important are these slabs in proper operation of the pumps?
Replacing these would be a bit of a project. I am not looking to make work if the issue is only appearance.
If the recommendation is to replace, should I just replace them with another pre-made slab?
Or can I just buy a stepping stone or some other hard surface solution?
Or should I just make a frame and mix my own concrete? How thick is thick enough to last a long time? Rebar required or just plain concrete?