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 3.4. The Pentair FNS Plus 48 leads on value. The Pentair FNS Plus 48 costs $180 less ($1,379 vs $1,559).
Hayward ProGrid DE4820
#6 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 $1,559$1,559
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 $16.24 per gpm ($1,559, 96 gpm)).
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 DE4820 |
|---|---|---|
| Overall rating | 3.5/5 | 3.4/5 |
| Value 35% | 61 $14.36 per gpm ($1,379, 96 gpm) | 51 $16.24 per gpm ($1,559, 96 gpm) |
| Filter area 30% | 54 48 sq ft of filter area | 54 48 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 DE4820 | |
|---|---|---|
| Filtering | ||
| Filter type | D.E. | D.E. |
| Filter area | 48 sq ft | 48 sq ft |
| Maximum flow | 96 gpm | 96 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 |