Depending on how well you want to treat the water we would use a variation of the following setup:
- Firstly, on the water feeding into the tanks, I would strongly recommend a good First Flush Filter like the Superhead as it gets rid of most of the dust and bird droppings that accumulate on the roof. Especially the Nitrates in the bird droppings is a nightmare to try and filter out so this step is essential, one Superhead can handle about 100m2 of roof area. http://www.filtershop.co.za/superhead-rainwater-tank-filter
- Then have the Superhead feed the tank or tanks. In the tank, we can then place In-Tank UV lights that can run on a 6 hour a day timer just to keep bacteria levels low in the tanks. This will extend the lifespan of the lamp to 4 years between changes. http://www.filtershop.co.za/submersible-ultra-violet-uv-lights-click-for-more-information
- Then from the tank you would want a pump that is controlled by a level switch in the final tank (if it is an option to have two tanks), from our experience you don’t need that strong of a pump here but we normally use the DAB Jetsmart purely as it is one of the most reliable pumps around.
- Then after the pump, we can fit a 20um Washable Disc Filter to act as our main barrier for dust and we mainly use this to dramatically extend the lifespan of the filters after it. http://www.filtershop.co.za/disc-filters
- Now we get to our microfiltration, for this, we use a Triple Big Blue. This system uses replaceable cartridges and there are many combinations of cartridges that can be used, here is what we would recommend: http://www.filtershop.co.za/triple-stage-home-water-filtration-on-a-stand-unit
- Firstly a 1um Sediment Filter that we use to filter as small as we can with the cheap cartridges as this protects the finer cartridge follows it.
- The second filter is a 0.1um Pleated filter that is a physical barrier for bacteria, this is an extremely fine physical filter and thus it limits the flow to around 1200 LPH.
- Then lastly to catch smells and tastes in the water we would recommend a Premium KDF Filter as it has an active component that prevents bacteria growth in the filter and it also reduces some of the heavy metal levels in the water.
- Then feed into your final tank, here again, you would want an In-Tank UV Light but this time you would want to run the lamp full time to make sure that your water stays sterilized. http://www.filtershop.co.za/submersible-ultra-violet-uv-lights-click-for-more-information
- Then from the tank, we can feed your house through the EsyBox Mini, it will be able to supply enough water to run all 3 showers and one other point at the same time and then effectively use you’re your final tank as a buffer.
- Then on a loop back to the first tank, we will need a pH Correction vessel to be able to compensate for corrosiveness of the rainwater. http://www.filtershop.co.za/ph-correction-calcite-vessel
- Also on the loop back to the tank we recommend placing an In-Line Chlorinator to be able to sterilize the whole system periodically, ideally weekly but in practice, most people sterilize the system once a month. This can be automated with a garden timer too. http://www.filtershop.co.za/inline-chlorinator
This would be the ideal setup, if you need to cut some costs you can dose chlorine manually or even correct the pH manually, but the complete setup would be ideal.