Pressure question

[flyinokra]

I just changed the filter sand in my 25" filter with 300lbs of new pool filter sand. I back washed for about 5 or 6 mins and the water was nice and clear in the sight glass. I then rinsed for about 2 mins. So I then turned the pump off then to filter and turned the pump back on. I was expecting the pressure to be in the neighborhood of 12 PSI but it was 20 PSI. I changed the gauge when I changed the sand because the other one didn't work so I don't think it is the gauge. My question is is that to high or is that just where mine is going to be with clean sand?

 

[Divin Dave]

did you turn it off and on a couple times? Flick the gauge with you knuckle and it still repeated at 20?

If so, then thats prolly just where its at with the new sand.

 

[flyinokra]

Dave thats funny you should say that. I did turn it on and off a couple of times and tapped it with my screwdriver.

 

[Divin Dave]

welp,
there ya go then. The clean pressure is 20with your new sand.

 

[Yev]

Any chance that your new sand is a smaller particle size than the old sand. Smaller grains will cause higher pressure, so that might explain it.

 

[Propbndr]

If you original gauge was not working, how do you know the new one is inaccurate? Did you install the new gauge first, run your filter, then change your sand? My filter, after backwash, runs at 18 psi and loves 20 (that is with the old sand and new sand after I changed it). I just let her run until it gets to 25 psi or so.

 

[samt]

I have had different gauges over the yrs and they all seem to have a different benchmark reading.

 

[Patrick_B]

Yea, that's just the problem. Some are better than others and none of them are extremely precise. While 20 seems a touch high, it really isn't wrong, its just what you have. But at least you know where you are. If it isn't one, a nice Glycerin filled gauge is good to have. They tend to be a bit better in terms of overall quality/accuracy.

 

[flyinokra]

Thanks for the replies. It's my first pool and I'm just learning as I go.

 

[Patrick_B]

Well, there is no shame in that. In fact, quite the opposite.

Glad you found the forum, and it's good to have you with us.

 

[pooldv]

Yep, welcome to TFP! Flyinokra! LOL. Need to fly some okra into a fryer and onto my plate! :-D