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Rainwater Harvesting Limited supplies rainwater harvesting storage tanks, pumps, filters and management systems to households and commercial businesses. [link widoczny dla zalogowanych] is a large information resource offering valuable technical information and advice in addition to 1000s of product specifications. Download the invaluable rainwater harvesting tank size calculator
I would think the majority of new builds in the UK are now fitted with rainwater harvesting. It saves money on the water bills, beats the hosepipe ban for garden watering and helps the home builder achieve Level 3 or 4 of the Code for Sustainable Homes which most councils need before giving planning permission.

So if you've got all that stored rain water, why [link widoczny dla zalogowanych] not bath in it and drink it?

In many countries they do but, in the UK it is deemed non-potable.

However, I would like to advise that a determined UK homeowner can get the okay to use rainwater as potable water. In practice, it is [link widoczny dla zalogowanych] vital to get water tested if the users or authorities want to be certain of [link widoczny dla zalogowanych] its quality. There are testing companies all over Britain and one can identify them locally when required.

The UK Government's requirements are at It's quite a read.

The World Health Organisation wades in at :

Most council inspectors will want to see test results and a confirmation from a supplier that the equipment will handle whatever might be polluting the water. The most common pollutants and their remedies are as follows:

1) Bacteria. The most common pollutant of rainwater off the roof of a building is bird [link widoczny dla zalogowanych] droppings and the bacteria that these carry. Ultra-violet filtration kills bacteria, but remember that the filter must be turned on 24/7 and there must be a way of warning the users that a bulb is failing or has failed. Double bulb UV filters are available, as are ones [link widoczny dla zalogowanych] with suitable alarms. A cartridge filter prior to the UV filter ensures that bacteria does not get through the UV filter hiding behind a particle; that's what authorities might be concerned about. If the rainwater has been filtered and stored in an [link widoczny dla zalogowanych] underground tank with rodent [link widoczny dla zalogowanych] protection, calming device at the [link widoczny dla zalogowanych] input and floating intake to the [link widoczny dla zalogowanych] pump, then a second filter in line with the UV filter is not required because the water will be particle free (as with the Carat systems).

2) Chemicals. If the building is in the lea of an industrial zone then testing might show that there is a level of chemicals in the water. A carbon filter is necessary to absorb such chemicals.

3) Heavy metals, nitrates and nitrites. If tests show a presence of heavy metals, then redox alloy cartridges are needed.

4) Reverse osmosis removes everything. If a small quantity of high quality drinking water is required then a reverse osmosis plant can deliver small quantities (glass-fulls) with everything [link widoczny dla zalogowanych] removed (including the [link widoczny dla zalogowanych] taste).

We know of nobody who extensively recommends [link widoczny dla zalogowanych] the installation of equipment for adding chemicals to rainwater, but it's an option.

The bulk of tests in the UK show the presence of minute quantities of bacteria (as would spring or well water) for which Ultra-Violet filtration is ideal. Our recommendation is to install the Carat tank with a UV filter, then have a test done after commissioning and the first couple of rainfalls.

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