iSpring WF150K
#3 in TankFull review
A backwashing carbon tank for owners who want a long life system with a long warranty and have a drain nearby.
Amazon $1,673.70$1,673.70
The iSpring WF150K is the better whole-house water filter overall, rated 3.3 to 2.9. The iSpring WF150K leads on certification. The LiquaGen FK-CAT 10x54 wins on price. The LiquaGen FK-CAT 10x54 costs $823.71 less ($849.99 vs $1,673.70).
LiquaGen FK-CAT 10x54
#5 in TankFull review
A cheaper backwashing catalytic carbon tank for a large city home with chloramine. Its claims are not backed by testing or a warranty term.
Amazon $849.99$849.99
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 iSpring WF150K for certification (tested to NSF/ANSI 42, 53, not certified vs no certification in a public listing, no tested to claim).
- Choose the LiquaGen FK-CAT 10x54 for price ($849.99 vs $1,673.70).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every tank whole-house water filter; a clear win is highlighted. How we rank explains each one.
| Factor weight | iSpring WF150K | LiquaGen FK-CAT 10x54 |
|---|---|---|
| Overall rating | 3.3/5 | 2.9/5 |
| Running cost 25% | 50 filter cost or capacity not published (neutral score used) | 47 $0.85 per 1,000 gallons ($849.99 every 1,000,000 gallons) |
| Certification 25% | 30 tested to NSF/ANSI 42, 53, not certified | 0 no certification in a public listing, no tested to claim |
| Flow 15% | 50 flow not published (neutral score used) | 70 12 gpm service flow |
| Price 20% | 40 $1,673.70 | 87 $849.99 |
| Warranty 15% | 100 10-year warranty | 0 warranty not published, scored as none |
Specifications
| iSpring WF150K | LiquaGen FK-CAT 10x54 | |
|---|---|---|
| Filtration | ||
| Capacity | - | 1,000,000 gallons |
| Replacement filters or media | $1,673.70 | $849.99 |
| Running cost | - | $0.85 per 1,000 gal |
| Stages | 1 | 1 |
| Tested to (not certified) | NSF/ANSI 42, 53 | - |
| Chloramine | No | Yes |
| PFAS | No | No |
| Build | ||
| Flow | - | 12 gpm |
| Ports | 1 in | 1 in |
| Backwashing | Yes | Yes |
| UV stage | No | No |
| Warranty | 10 years | - |