Through InYo this year I replaced my pump and top mount sand filter. After installation the pump suction was poor with the water level in the pump barely covering the basket and not filling to the top of the see-through cover as it did before replacement. This caused poor suction at the pool skimmer which didn't provide enough suction to vacuum the poor when on filtration. Plenty of suction in waste mode (including backwash and rinse) which means there is no obstruction in the line. What could be wrong with the filter that is causing the pump not to fill up generating the correct amount of suction for vacuuming and proper filtration; psi is high at 31.
thank you, Mark