The concept of collecting and using rainwater is hardly new; it certainly dates back to Roman times and probably before. What has changed now, as with most other aspects of life, is the technology available to implement it.
In particular this relates to filtration, which we believe to be the most important part of any good system; if the water is cleaned as much as possible prior to being stored, then it is least likely to lead to any problems.
Water that is unfiltered can deteriorate, particularly if there is significant organic matter present as this will ‘strip out’ the oxygen from the water. As a result the water can become stagnant, discoloured or malodorous.
Where water is required for use within toilet cisterns, washing machines or industrial processes it needs to be as clean as possible and not be unpleasant to use. Careful design is therefore very important.