Sand filter pressure

EmilyOTR

Bronze Supporter
Feb 15, 2017
521
Ferndale, MI
So, my sand filter pressure is normally around 20 and I backwash when it gets around 25 or so. tonight I noticed my returns weren't working, my SWG said no flow and the pressure on the filter was at 30. I've never seen it that high. I backwashed 5 days ago, but it is May and pollen is falling like crazy. I backwashed, turned everything back on and returns are normal, SWG says flow is good but the pressure on the filter is around 28. what do I do?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,645
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
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Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
When did you open? Looking back at your Poolmath logs, the FC was quite low at one point. Did you open to a crystal clear pool, or did you have cloudiness/algae? Did you run a SLAM Process? Your spike in filter pressure is reminiscent of excessive organics.
 

EmilyOTR

Bronze Supporter
Feb 15, 2017
521
Ferndale, MI
I opened May 12, crystal clear, but green (due to a hole in my cover), but very low water level, after adding liquid chlorine and water, the pool was blue. I was planning to SLAM but when the color drastically changed, I just did an OCLT and passed.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,645
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
Oh, I remember that now. Well, even though the water transitioned to blue and you passed an OCLT, if the water wasn't crystal clear the SLAM may have been stopped too soon. You probably also have a tremendous amount of dead algae that sill needs to be filtered-out which would explain the quick rise in pressure. Pollen can cause some problems, but may not be 100% responsible for what you are experiencing. When was the last time you did a deep clean of the sand? Perhaps it's time for that as well?
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,645
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
It's good to do a sand deep clean at least every 2-3 years (IMO) to ensure the sand doesn't get compacted or channeled to a point that impedes proper filtering through the sand. It can be done at any time throughout the season. Those who close their pool each year do it at that time. The main issue some owners have is how the MPV is plumbed. Some installers glue everything to a point moving the MPV and PVC lines can be challenging. But some installers used unions which makes disconnecting easy.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
Jun 22, 2014
33,645
Texas, San Antonio/Marion, South-Central Area
Pool Size
17888
Surface
Fiberglass
Chlorine
Salt Water Generator
SWG Type
CircuPool RJ-45 Plus
last night after backwashing it was at 30. I shut it off for the night. this morning when it came on, it was at 28. Now, about 1 hour later, it's at 25.
Based on what was happening before that is odd. Perhaps your pressure gauge is bad? Some signs of a bad gauge are if it doesn't fall completely to zero when the pump is off, if it seems to stick in different places,, fluctuates a lot, or is leaking oil.
 

EmilyOTR

Bronze Supporter
Feb 15, 2017
521
Ferndale, MI
it does go to zero when it's off, it isn't leaking, and it doesn't fluctuate a lot....I mean, right now it's weird but I'm not sure I'd call this fluctuating a lot? it's down to about 23 now.
 
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