Hmmm, sounds like more than just a water issue. If the DE just game back through your jets, then you also have a filter issue. I would replace the sand, also checking for cracks or breaks in the laterals, and see if the filtrationimproves. If not, you can try adding the DE again, but only enough to raise your pressure by 1 psi. It is still possible that you have metals in the water--the way I understand it, if the pool service was using sequestrant, the metals wouldnt show on tests because they are in suspension. Do you have orange staining in your shower or toilet tank? I would also try putting the trichlor tab on top of a layer of cotton balls, and pour some of your water over the tab to see if and orange "drops out". On the cotton.

For now, don't duplicate post in the metals forum because it makes it hard to stay organzed, but I'm going to shoot Marie an email and ask her i put on your situation. If t turns out that metal is the problem, we can always move the thread.

Janet