Pentair FNS Plus 48
#5 in D.E.Full review
A grid D.E. filter for an in-ground pool of up to about 46,080 gallons, for owners who want the clearest water and will handle D.E.
Amazon $1,379$1,379
The Pentair FNS Plus 48 is the better pool filter overall, rated 3.5 to 3.0. The Pentair FNS Plus 48 leads on value and filter area. The Pentair FNS Plus 48 costs $10 less ($1,379 vs $1,389).
Hayward ProGrid DE3620
#9 in D.E.Full review
A vertical-grid D.E. filter for an in-ground pool owner who wants the clearest water and will add D.E. after each backwash.
Amazon $1,389$1,389
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Pentair FNS Plus 48 for value ($14.36 per gpm ($1,379, 96 gpm) vs $19.29 per gpm ($1,389, 72 gpm)) and filter area (48 sq ft of filter area vs 36 sq ft of filter area).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every D.E. pool filter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Pentair FNS Plus 48 | Hayward ProGrid DE3620 |
|---|---|---|
| Overall rating | 3.5/5 | 3.0/5 |
| Value 35% | 61 $14.36 per gpm ($1,379, 96 gpm) | 37 $19.29 per gpm ($1,389, 72 gpm) |
| Filter area 30% | 54 48 sq ft of filter area | 31 36 sq ft of filter area |
| Valve 10% | 50 valve type not published (neutral score used) | 50 valve type not published (neutral score used) |
| Pressure rating 10% | 100 50 psi maximum working pressure | 100 50 psi maximum working pressure |
| Warranty 15% | 33 1-year warranty | 33 1-year warranty |
Specifications
| Pentair FNS Plus 48 | Hayward ProGrid DE3620 | |
|---|---|---|
| Filtering | ||
| Filter type | D.E. | D.E. |
| Filter area | 48 sq ft | 36 sq ft |
| Maximum flow | 96 gpm | 72 gpm |
| Largest pool | 46,080 gal | - |
| Pool type | In-ground | In-ground |
| Build | ||
| Tank diameter | 21.5 in | - |
| Maximum pressure | 50 psi | 50 psi |
| Ports | - | 2 in |
| Air relief | Yes | Yes |
| Warranty | 1 year | 1 year |