What size is my filter

[theeviltwinn]

Hi All

I'm going to try using Fiber Clear this year and the bag tells you how much to use depending on how many square feet your filter is. I have a Proline DE model 40 filter. It is 10 years old, and while the owners manual technically exists, finding it wold be better left to someone like Indiana Jones.

I measured the grids. there are 4 @ 8.5" x 12" and 2 @ 7" x 12". that equals 4' x 1' times 2 sides which equals 8 squre feet. Is this right? What has me confused is the chart on the bag starts at 24 sq feet. That is a long way from 8. If my math is right I can just use 1/3 of the amount in the chart.

It is a 15' round above ground pool if that matters.

Thanks for your help

Mike

 

[Melt In The Sun]

Proline DE model 40 = 40 square feet? I thought that was the typical numbering scheme. All the ripples and curves and wrinkles add to the surface area.

 

[PoolGuyNJ]

I would agree, 8 square feet is still 1/3 of 24 sq.ft in NJ too! So 1/3 the amount for a 24 square foot recommended amount would be the appropriate initial amount. Expect 10% to remain after backwashing so reduce recharges accordingly until you clean the grids again.

Scott

 

[theeviltwinn]

Thanks MITS. That is what I first thought. Model 40 = 40 sq ft But, the grids are flat with a sock over them. There are no curves or wrinkles.

Thanks Scott.

I guess another way I could double check is the filter uses 3 scoops of DE. The Fiber Clear website says it takes 1/8 the amount of FC. So 3/8 of a scoop should do it.

Mike