Waterdrop WD-ED05TW rechargeable electric filter dispenser: how it works

The Waterdrop WD-ED05TW is a countertop water filter dispenser in white that is powered by a built-in rechargeable battery. Instead of waiting for water to trickle through a pitcher, you press a button and it dispenses filtered water. Waterdrop describes the output as "0 TDS" water. Here is what that and the other features mean.

What "0 TDS" means

TDS stands for total dissolved solids, a measure of the minerals, salts and other substances dissolved in water, usually given in parts per million. A TDS reading of zero is typically associated with highly purified water, which is also flat-tasting because the minerals are gone. It is a number, not a quality guarantee, and it says nothing on its own about specific substances. Waterdrop uses the term to describe what the unit delivers; check the brand's documentation for the details of how that is measured.

Four-stage filtration

Waterdrop says the 4-stage system reduces more than 20 contaminants, including chlorine and lead, for cleaner and better-tasting water. In general, multi-stage filters combine several layers, often something like a pre-filter, activated carbon and a membrane or resin, with each stage handling different substances. The brand's own data sheets and test reports are the right place to see exactly which substances are covered and by how much.

The listing also states that the model uses the replacement filter WD-EWFT1. Confirm that it is available before you buy, and check how often it needs changing.

One-touch dispensing

The "electric" part is a pump. Rather than gravity pulling water through the filter, a button starts the flow and Waterdrop says you get filtered water in about a second. That is the main difference from a standard pitcher, where you refill the top and wait for it to drain. The unit is described as holding 15 cups, which is a little under 3.5 litres.

Battery and charging

The battery is said to last up to 20 days of standby on a full charge. It charges through a USB Type-C cable, which is included, though the power adapter is not. A power indicator flashes red when it's time to recharge. Since heavy use drains a battery faster than standby, the real interval between charges depends on how much you pour.

Filter life indicator

A second indicator signals when the filter may need replacing. Indicators like this are usually based on use or time rather than a direct water-quality reading, so it's still worth following the manual's guidance on replacement intervals and rinsing.

Who it suits

It suits households that go through a lot of filtered water, offices and shared kitchens where people don't want to wait for a pitcher to refill, and anyone who prefers a button to a lid. It is less suited to people who want a plumbed-in system or who don't want to remember another device to charge.

What to check before you buy

• Counter space: check the dimensions against the gap under your cabinets and how you'll refill it.
• Charging: make sure you have a USB-C adapter and an outlet within reach.
• Replacement filters: find out how often they are needed and whether they are available where you live.
• What you want removed: read the brand's test data for the specific substances you care about.
• Taste preference: very low-mineral water tastes different from tap water.
• Cleaning: check the manual for how to clean the reservoir.

The short version

• A rechargeable, countertop electric filter dispenser, model WD-ED05TW.
• Described as 0 TDS output with 4-stage filtration of more than 20 listed contaminants.
• One-touch dispensing in about one second; 15-cup capacity.
• Up to 20 days standby per charge via USB Type-C.
• Indicators for recharging and filter replacement; uses filter WD-EWFT1.

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