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 tank, 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 from the tank, we can feed your house through the EsyBox Mini, it will be able to supply enough water to run all 2 showers as it will be restricted by the filters, if you need a larger flow you can, however, use multiple filters in parallel. This pump is one of the most reliable pumps around and provides a municipal like water delivery in the house.
- 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 and a UV light as a final barrier for Bacteria. 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/premium-2700lph-complete-home-uv-filtration-solution-on-a-stand-unit-click-for-more-info
- 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 a high-quality stainless-steel UV light that is basically a safety barrier to make sure you don’t get any bacteria getting through if something else goes wrong. We are recommending the Premium units mainly as they have hour counters and you can see when the bulb needs to be replaced.
- 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.