Quick verdict
A practical no-plumbing option if you accept tank refills, worktop space and waste-water management.
At a glance
| Format | Countertop reverse osmosis |
|---|---|
| Rated output | 75 GPD (manufacturer rating) |
| Drain efficiency | 3:1 pure-to-drain claimed by manufacturer |
| Hot dispensing | No |
| Filters | M6RFL cartridge; manufacturer indicates about 12 months |
What everyday use looks like
The M6SL is intended to live on a worktop. You add water to its feed tank and empty the separate waste-water compartment. Its detachable glass pitcher is helpful for serving or chilling, but requires worktop and handling space.
The manufacturer lists dimensions of 40.3 × 23.5 × 36.9 cm and a 5.5-litre combined tank arrangement. Check overhead clearance and power-socket placement.
Ongoing maintenance
Waterdrop lists the M6RFL replacement filter for about £70, with a nominal 12-month replacement schedule. The calculator can model it with your own expected system price, filtered-water volume and local water charge.
Use the running-cost calculator for a transparent estimate with editable assumptions.
Reasons to skip it
A countertop appliance can be awkward in a very small kitchen. If you want water from a dedicated tap or need instant hot dispensing, this model is not that solution.
Our decision checklist
- Measure your available space, including access for filter changes.
- Check the official installation and filter manual.
- Verify prices, included filters, warranty and delivery at checkout.
- Look up your water provider's quality report before assuming RO is necessary.
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Sources & verification
Facts below are taken from the linked sources; product information may change. Last editorial check: 13 November 2026. No hands-on product testing was performed.