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Showing results for tags 'pump skimmer main drain'.
My pump allows me to set it to run from the main drain, skimmer, or both. When running from the main drain only, everything runs smooth. When I set it to either the skimmer or skimmer and main drain, the pump has problems drawing water. It will draw water from the skimmer (that is, water is being sucked out of the skimmer in the spa), however the pump does not fill all the way with the water and the spa jets only pump out water sporadically unlike continuously with the main drain only. I noticed the filter pressure drops around 10 psi (30 psi total) when running the skimmer. Any advice please?