I have a 5 1/2 year old pool. I just replaced the filter cartridges for the first time and they really helped clean up the pool and make it clear. However, my sheer descent is only partially working. Water is only coming out 1/2 the waterfall. Also, on the same side of the pool where the waterfall isn't working, the jets aren't working either. I'm wondering if it's a clog or something. I've cleaned all the baskets, etc. I've adjusted the levers on the valves, etc. Not sure how to fix it. Can anyone give any advice on this? Thanks.