I was wondering if the experts on here would recommend adding a small pump to my waterfall feature ?? The reason I ask is because my 3 sheer descents seem to need a little more water flow when the filter gets a little dirty, meaning the water slows down somewhat effecting the flow from the sheer descents. I only have (1) VS 1.5 hp pump for the 18,000 IG pool. When the filter was new the flow seemed OK. Thx