I'm experiencing extremely high PSI in my sand filter (Sand Dollar SD60). I'll backwash and within an hour or so it's at 23-25psi and the jets are pushing little to no water out in the pool.
I've replaced the sand, cleared the water of algae, cleaned the sand after clearing the water with a chemical cleaner, replaced the multi-port valve and plumbing.
My first thought was air getting in - but when it is recirculating, the PSI stays at a constant 10psi... so I don't think it's the valve or plumbing.
Could it be the pipe or laterals inside of the filter (as far as I can tell, no sand is getting in the pool)? There was a small amount of sand in the drain plug, but I haven't seen evidence of sand anywhere else that I can tell. The water is cloudy but the chlorine is high from the intense shock to clear algae.
I've replaced the sand, cleared the water of algae, cleaned the sand after clearing the water with a chemical cleaner, replaced the multi-port valve and plumbing.
My first thought was air getting in - but when it is recirculating, the PSI stays at a constant 10psi... so I don't think it's the valve or plumbing.
Could it be the pipe or laterals inside of the filter (as far as I can tell, no sand is getting in the pool)? There was a small amount of sand in the drain plug, but I haven't seen evidence of sand anywhere else that I can tell. The water is cloudy but the chlorine is high from the intense shock to clear algae.