Postby Walter » Fri 21 Jul, 2006 06:40
too much sand or broken laterals in the bottom of the sand filter. When ever you do a sand change you should also fill the empty filter half way with water before putting new sand in to prevent the breaking of the laterals.
We are a custom pool and spa builder. We can only offer suggestions with the information given. Don't hesitate to email me if you have a questions and I will answer it as best as I can or point you in the right direction.