Waterdrop TK15-A
A small, low-priced certified gravity filter for one to three people, a trip or an RV.
Amazon $119.99$119.99
The Waterdrop TK15-A is the better gravity water filter overall, rated 3.4 to 2.6. The Waterdrop TK15-A leads on value and certification. The Waterdrop TK15-A costs $229.01 less ($119.99 vs $349).
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.
Boroux Compact 1.8 Gal
#13 in Up to 2.25 galFull review
A small stainless gravity filter for one or two people with long-life filters. It costs more per gallon of tank than larger rivals.
Amazon $349$349
Which should you buy?
- Choose the Waterdrop TK15-A for value ($79.99 per gallon of capacity ($119.99, 1.5 gal) vs $193.89 per gallon of capacity ($349, 1.8 gal)) and certification (states certification to NSF/ANSI 42, NSF/ANSI 372 vs states certification to NSF/ANSI/CAN 372).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every up to 2.25 gal gravity water filter; a clear win is highlighted. How we rank explains each one.
| Factor weight | Waterdrop TK15-A | Boroux Compact 1.8 Gal |
|---|---|---|
| Overall rating | 3.4/5 | 2.6/5 |
| Value 25% | 71 $79.99 per gallon of capacity ($119.99, 1.5 gal) | 16 $193.89 per gallon of capacity ($349, 1.8 gal) |
| Running cost 15% | 75 $0.012 per gallon filtered ($34.99 per element, 3,000 gal each) | 71 $0.013 per gallon filtered ($79.50 per element, 6,000 gal each) |
| Capacity 15% | 0 1.5 gal tank | 7 1.8 gal tank |
| Certification 20% | 40 states certification to NSF/ANSI 42, NSF/ANSI 372 | 10 states certification to NSF/ANSI/CAN 372 |
| Element life 15% | 100 3,000 gal rated per element | 100 6,000 gal rated per element |
| Warranty 10% | 11 1-year warranty | 0 warranty not published, scored as none |
Specifications
| Waterdrop TK15-A | Boroux Compact 1.8 Gal | |
|---|---|---|
| Capacity and flow | ||
| Tank capacity | 1.5 gal | 1.8 gal |
| Price per gallon of capacity | $79.99 | $193.89 |
| Elements included | 2 | 2 |
| Maximum elements | 2 | - |
| Filtration | ||
| Element type | Coconut shell carbon filter (black) | Boroux Foundation Black carbon element, 9.5 in |
| Certified | NSF/ANSI 42, NSF/ANSI 372 | NSF/ANSI/CAN 372 |
| Certification detail | Listing: system passed NSF/ANSI 372 (lead-free materials) and the black carbon filter is certified to NSF/ANSI 42 for chlorine, taste and odor. | Filter listing (maker copy): NSF/ANSI/CAN 372 certified by WQA, a lead-free materials standard, not a contaminant reduction certification. System listing: filters tested and independently verified by third-party accredited laboratories, none named. |
| Fluoride | Add-on filter | Add-on filter |
| Running cost | ||
| Rated life per element | 3,000 gal each | 6,000 gal each |
| Replacement element | 35 $ | 79.5 $ |
| Cost per gallon filtered | $0.012 | $0.013 |
| Build | ||
| Material | 304 stainless steel | 304 stainless steel |
| Height | - | 17.5 in |
| Diameter | - | 8 in |
| Warranty | 1 year | - |