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Author Topic: Better rainwater pre-tank filter?  (Read 10487 times)
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« Reply #15 on: April 09, 2012, 10:36:32 AM »

I suppose it depends what you are using this water for, but if, like us, it is only for flushing toiilets then isnt 5 microns a bit OTT?

We've been harvesting rain water for a few years now in a system that is in constant flux 'cos I just can't help tweeking it!
Essentially the downpipe runs into an initial collector that sits on our flat roof; this is a recycled 200litre cold water plastic tank with an old mosquito net bungeed around the top......I've found that this acts as a good 'absorber' when we get full-on downpours and also allows the stuff that gets through the net to settle to the bottom......the water then flows down into three interconnected IBCs via 22mm HEP20 (in hindsight I wish I had gone for something with a bigger bore).
As we only use this water for flushing toilets I am not too fussed about getting it any cleaner, and if it starts to get too green, or too many insects start turning up for swimming lessons then a couple of litres of the cheapest thin bleach goes in to the IBCs.
I did buy one of those fancy German Wisy filters on Fleabay for about 20 (we had considered hooking the IBCs up to the washing machine) but it was dumping 80percent of the rain water instead of the claimed 20 (?) per cent.......I suspect operator error played a part as they do get good reviews, and it sits in my shed awaiting the next reinvention of the wheel.
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A bad job good, Hired. A good job bad,You're Fired

« Reply #16 on: April 14, 2012, 05:31:01 PM »

I've given up using head filters from the gutter down pipes, in as much as removing leaves and other large objects. I found that although partical fitering was effective, it quickly began to clog with water ever passing through slowly, the filter housing then began overflowing. It became too a regular maintenance to cleaning the filter housing's out. I now allow all small particals to pass. Through seperation process in the tanks the particals fall to the bottom of the tank (just like beer clearing). As long as the bottom is not disturbed, the water above is clear. When the tanks evently overflow any surface hugging debris is flush away.
If the IBC are totally burried away from daylight, bacteria will remain low, This is dealt with on demand from the tanks.

After a few years of use, simply drain the tanks and flush.

Here's my system,4404.0.html  

Here is a picture showing the typical clarrity of the collected water.

* 413.jpg (120.06 KB, 564x423 - viewed 425 times.)
« Last Edit: April 14, 2012, 05:40:24 PM by peater » Logged
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