I had a Hayward S244T Sand Filter installed a couple years ago and now I'm having sand enter the pool under the return jets. I vacuumed 75% of the sand last week, haven't back washed since and I'm seeing more sand along the edges of the pool where I had cleared the sand in the past. Is it likely that my laterals or something else in the filter gone bad this quickly? I live in NJ and we had a cold winter. I'm not handy and I've already spent hours working on the pool yet haven't gone swimming yet. How much should such a repair cost?