Express Water Anti-Scale WH300SCPS
#16 in CartridgeFull review
For hard city water where scale on the water heater is the main worry but a softener is too much. It doesn’t soften.
Amazon $503.12$503.12
The Express Water Anti-Scale WH300SCPS and the Express Water Heavy Metal WH300SCKS are evenly matched, rated 2.4 and 2.4. The Express Water Heavy Metal WH300SCKS costs $3.13 less ($499.99 vs $503.12).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
Express Water Heavy Metal WH300SCKS
#17 in CartridgeFull review
A frame mounted three stage system for city water where lead from old pipes is the worry. Its heavy metal claims aren’t certified.
Amazon $499.99$499.99
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every cartridge whole-house water filter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Express Water Anti-Scale WH300SCPS | Express Water Heavy Metal WH300SCKS |
|---|---|---|
| Overall rating | 2.4/5 | 2.4/5 |
| Running cost 25% | 18 $1.84 per 1,000 gallons ($183.67 every 100,000 gallons) | 15 $1.99 per 1,000 gallons ($198.88 every 100,000 gallons) |
| Certification 25% | 0 no certification in a public listing, no tested to claim | 0 no certification in a public listing, no tested to claim |
| Flow 15% | 100 15 gpm service flow | 100 15 gpm service flow |
| Price 20% | 28 $503.12 | 28 $499.99 |
| Warranty 15% | 0 1-year warranty | 0 1-year warranty |
Specifications
| Express Water Anti-Scale WH300SCPS | Express Water Heavy Metal WH300SCKS | |
|---|---|---|
| Filtration | ||
| Capacity | 100,000 gallons | 100,000 gallons |
| Replacement filters or media | $183.67 | $198.88 |
| Running cost | $1.84 per 1,000 gal | $1.99 per 1,000 gal |
| Stages | 3 | 3 |
| Chloramine | No | No |
| PFAS | No | No |
| Build | ||
| Flow | 15 gpm | 15 gpm |
| Ports | 1 in | 1 in |
| UV stage | No | No |
| Warranty | 1 year | 1 year |