Hi all. I am having a problem with my filter pressure.My pressure is generally about 18 - 20. I went out tonight and backwashed (pump was off) and the pressure shot up to 50 and blew my backwash lines apart. I thought maybe I had a restriction in my backwash line so I switched back to filter and turned the pump back on and the pressure shot up just as high. So then I tried waste, pressure still high but maybe only 40. Then I tried recirculate. Pressure still high (around 40) but a little water was coming out my backwash line. I let it run for a minute thinking there was just a little pressure releasing but it continued. So now I basically have high pressure on all filter settings. I think the backwash initiated the problem.
Now, the rest of the story.... We had a freak cold snap with a hard freeze for an extended period here in oklahoma last month. The lows reached the teens with highs in the 20s for about a week. In general the winters are pretty mild and freeze timers do the trick (This is our second winter with the pool and left it open last year with freeze timer and no problems). I did go out and drape canvas and tarps over the filter and pump and placed 350 watts of halogen light in there during the coldest weather. While the pool froze over the pump continued to run just fine with reasonable pressures as I checked it daily. It is now reaching into the high 50s (sometimes 60s) daily with lows in the upper 30s and everything has completely thawed.
Sorry for the long post but it's supposed to get down to 29 this weekend and am hoping I can resolve this before then as I am leaving my pump off for now. Thanks in advance.