If my pool filter label is worn, how do I know how much DE to add?

[macdonjo]

New house. I hired a pool contractor to do some upgrades and show me around but I forgot to ask him one question - how do I know how much DE to add in after backwash? The filter label is kinda worn.

It's a purex triton nautilus FNS. I see online it comes in 4 sizes but I can't find any sort of dimensions. I'm wondering if I could just measure the diameter and match it to one of them?

 

[macdonjo]

My luck, been thinking about it all night and may have figured it out shortly after finally posting this.

https://images.inyopools.com/cloud/documents/pentair-filters-nautilus-fns.pdf

So I found those measurements on page 10 and measured length "B" and got 52.5" which is pretty close to 53.25" so I'm thinking it's FNS 60.

If I'm off my rocker, please let me know.

 

[Rancho Cost-a-Lotta]

Sounds like you figured it out. Next time you disassemble the filter, measure the grids. You should be able to to compare dimensions to online replacements to confirm your findings.

 

[jsygrls]

4.8 lbs. but you may want check this out ....https://www.inyopools.com/blog/how-much-de-to-add/

 

[ajw22]

4.8 lbs. but you may want check this out ....https://www.inyopools.com/blog/how-much-de-to-add/

FNS60 Manual says 6 lbs of DE for a clean filter. Add 5 lbs (80%) of DE after a backwash.

Rule of thumb - 1lb per every 10 square feet.

 

[macdonjo]

Sounds like you figured it out. Next time you disassemble the filter, measure the grids. You should be able to to compare dimensions to online replacements to confirm your findings.

I haven't disassembled the filter yet. I'm going to have to spend some time researching before I tackled that