How much water does a gravity system produce per day?

That comes down to the number of elements and the size of the chambers. You can refill the top chamber as often as you like, so in practice the flow rate sets the daily output. For a family, choose a larger unit or add elements so you are not waiting on it.

Does a home system filter out viruses?

Elements rated to 0.1 micron stop bacteria and protozoa, but viruses are smaller than that. If you are treating water from a source you cannot judge, add water purification tablets as a second step or use a setup tested specifically for viruses. For ordinary mains water in Europe this is not a concern.

Filtering without power

Gravity water filters

Countertop gravity systems with a large reservoir for use at home. Choose on daily output, household size and the rated life of the elements.

More about gravity water filters

A gravity water filter is a two chamber system: you pour water into the upper container, gravity pulls it through the elements and clean water collects below. No electricity, no mains pressure and no plumbing work, so it keeps running through a power cut or a supply failure. The elements hold back bacteria and protozoa down to 0.1 micron and are rated for anything from a few thousand to hundreds of thousands of litres. Capacity is far higher than on a backpacking filter, which is what makes it practical for a whole household.

Filters

Burn

Burn Black Water Filter - 2 Pieces - 3000 Litres

2 items per pack

€89.94

In stock

Burn

Burn Water Filter - Up To 9 Litres Of Clean Drinking Water Per Hour

€199.95

In stock

Aqualogic

AQUA Logic - Gravity Filter

€74.95

Out of stock

Berkey

Dimensions: ± 26 x 26 x 71 cm
Volume: 17 L

€579.00

Out of stock

Start with volume. A smaller unit covers one or two people, while a larger one refills faster and suits a family. Then look at the rated life of the elements in litres and translate that into years at your own usage. Consider the source as well: mains water, rainwater and surface water put very different loads on an element, and cloudy water clogs it faster, so let sediment settle before you pour. Pore size does not stop viruses, so keep water purification tablets alongside the system if your source is uncertain. For the first days after an outage, packaged long life water is the quickest answer.

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Frequently asked questions

No. It runs on gravity alone: you fill the top chamber and the water works its way down through the elements. There is no pump, no plug and no connection to the mains. That is exactly why it keeps working during a power cut.

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