Hello: This morning about 30 minutes after turning on the pump and filter, I developed this huge oscillation. My daughter spotted it and said "Dad, we have a tidal pool." The water would bulge up, direct center, actually going higher than the edges of the pool, then fall, with water splashing over the sides, then repeat. It was strong/violent enough that if we had not noticed, I think the whole assembly would have easily torn itself apart.
Pool is above ground, 6,000 gallon round intex. A bought a 1.5HP pump and cartridge filter--it's strong, and more than enough for the pool, I'm told--maybe too much?
Question is, is it possible to dampen this? And not sure why it only happened now, when everything's been fine since I set it up about a week ago...
One more detail, the location of the input line is near the top water line. So the pump pushes water in and away, then the water rushes back in, then gets pushed away again--I guess this is what starts the oscillation.
It's quite a sight, with that huge bulge rising and falling. I'm sure it would be fun to swim in--but I'm also sure the forces being generated will soon result in disaster!