Quote Originally Posted by LG1003 View Post
Thanks for clarifying that.

Okay, here's what's going on as of today:

Pump was running but water was not flowing through the filter. I drained the spa and filled it. Water was slow to come at first but eventually did fill the spa. Water is now circulating through the filter but pressure is around 35. I have not been able to bring the pressure down this past week inspite of backwashing repeatedly and adding De each time.

Any suggestions? The filter is a STA-RITE and I'm guessing is around 15 years old.
Something's clogged. If the pump is pumping water nicely, then it's in the filter. Your screens may be clogged--soaking in muriatic acid is supposed to be how you clean them. They may be too far gone and replacement is necessary. Some input or output is clogged. Something, somewhere--even DE filters just aren't that complicated.