Express Water WH300SCKS 3-Stage Whole House, Heavy Metals review
By Daryna Klochko · Published · Specs checked Oct 15, 2026 · 
Scores 8.5/10, 10th of the 12 whole-house systems we track. At $547.99 it costs less than the category median of $854.12. Express Water publishes its own test data, but we found no certifier listing for its reduction claims; 3 of the 12 whole-house systems have one. On Amazon, 56 of the 99 reviews that mention leakage are negative.
Reliability comes first: 56 of 99 Amazon reviews about leakage are negative
- Price
- $547.99
- Certified for
- Brand claims only
- Flow
- 15 gpm
- Cartridge life
- 100,000 gal
- Cost per year
- $336
- Warranty
- 1 year
Certification
Materials listing only: Express Water publishes its own test data; we found no certifier listing that covers reduction claims.
Express Water also claims Chlorine, Chloramine, Lead, Arsenic: brand claims, not in a certifier listing.
The contaminants or other substances removed or reduced by this water treatment device are not necessarily in your water. Listing checked on Oct 15, 2026. What a listing means and what it doesn't
Specs and sources
Checked Oct 15, 2026 · source under each valueFiltration
Cartridges and install
Buying
Warranty, returns and shipping
Warranty: 1 year. Returns: 30 days. Shipping: not stated by the brand. Source: Express Water data sheet, checked Oct 15, 2026.
Source: Express Water data sheet, checked Oct 15, 2026.
Compared with similar whole-house systems
All 12 whole-house systems →| Model | Price | Certified for | Cost per year | Warranty | Score | Where to buy |
|---|---|---|---|---|---|---|
| Pentair FloPlus Protect 20BB Whole House PFAS System | $258 | PFAS | $187 | 1 year | 9.5/10 | Check price → |
| A. O. Smith AO-WH-FILTER Whole House Water Filter | $399.99 | Chlorine | — | 6 years limited | 8.25/10 | Check price → |
| 3M Aqua-Pure AP904 Whole House System | $424.71 | Chlorine | $325 | 25 years | 9.5/10 | See specs → |
| Express Water WH300SCGS 3-Stage Whole House, Essential | $497.99 | Brand claims only | $215 | 1 year | 8.75/10 | Check price → |
| Express Water WH300SCKS 3-Stage Whole House, Heavy MetalsTHIS MODEL | $547.99 | Brand claims only | $336 | 1 year | 8.5/10 | Check price → |
What owners say
Checked Oct 15, 2026- Home Depot store 4.6/5 381 reviews
56 of 99 Amazon reviews about leakage are negative. In our score this is 1.5 of 2 points. How we score
- Installation263 mentions240 positive23 negative
- Value for money222 mentions172 positive50 negative
- Taste165 mentions154 positive11 negative
- Odor removal148 mentions133 positive15 negative
- Leakage99 mentions43 positive56 negative
Store ratings change over time; the date shows when we checked.