Sizing a Sand Filter for my Pool

[JayH]

Hi. I'm trying to size a sand filter for my 18x34 oval pool with a deep end holding about 19,000 gallons. I thought cycling the water every 8 hours would be enough although I am new.
I get the first part of your equation, for me, 19,000 gallons divide by 8 divide by 60 equals 39.5 gallons per minute.
But the second part confuses me some. Is 15 gallons per minute per square foot a standard for sand filters?
If so, do I need a sand filter that holds 2.63 sq ft of sand? And from there find out if that is a 20" or 24" filter?
Thank you.

 

[duraleigh]

What is the HP and service factor of your pump? Oops I see it in your sig. Can you tell us the service factor (should be labeled "sf" on the plate

 

[JayH]

Hi Dave. I have looked at the pump, in the manual for the pump and online. I have found nothing that references the pumps service factor, only that it's hp is 1.5. Sorry about that.

 

[duraleigh]

What brand and model pump is it?

 

[JayH]

The pump is an XP I Powerline pump, it's 1 1/2 hp. Single stage.
Also, can you tell me your formula? Thanks!

 

[duraleigh]

The most important relationship is between the pump and the filter.....not the filter and the pool.

Generally, you should be able to calculate the gpm of the pump from a pump curve published by the manufacturer.

Once the pump gpm is roughly established, you filter gpm should be about 25% or so bigger.

I would suggest you call Doughboy and get help calculating the gpm for your pump and pool, then pick your filter based on that.

 

[JayH]

Alright, thanks for pointing me in the right direction. I will try my luck. Thank you!