@@ -67,19 +67,41 @@ A small 1kW pump is more than enough for that, and the power consumption will be
### Issue number 1: bacterial growth in the tank and bad smelling water
Sorry, not yet written this part, i'll do shortly
If you are going to use your grey water to flush toilets you will easily face the issue of the bad smell coming from the toilet water container and from the toilet itself.
This is due to the growth of bacterial in the tank, and it isn't only a bad odour issue, it's also a safety issue as some of those bacterial are dangerous.
An easy and relatively cheap solution is do sterilize the water in the tank using chemicals like chlorine. A common tab of chlorine commonly used for pools would work great for that
and will sterilize the water in the tank for more than a week. The issue there is that too many chlorine concentration in the water can ruin the piping and the pump, or even smell in another way, so, be carefull to avoid overdosage.
[HTW is working on a DIY project for a chlorinator](/post/chlorinator) that can help on that
A better but a little more expensive way is to use a natural bacterial colture to counteract the bad bacterials. An effectively working solution i found is to use
[biosystems Grey Water Addictive](https://www.sustainable.co.za/biosystems-500gm-grey-water-additive.html)
[HTW is working on a solid dosator project](/post/soliddosator) that can help to relieve you from manually dose every week the quantity of GWA to add.
Another way to solve the bacterial growth in tank should be to use a submersible UV light inside the tank, something like a 55W light should work enough well for a 1000l tank, but this will be somewhat expensive and i never tested how effective is.
### Issue number 2: deposit of lime and other substances in the tank
Sorry, not yet written this part, i'll do shortly
Another issue is that grey water contain some lime and/or greases that can slowly deposit in the tank and will need to be removed every now and then, and of course this isn't exactly a confortable thing to do.
A solution can be to use an [agitator](/post/agitator) and then filter out lime and greases using a gross washable filter in line with the pump.
The [biosystems Grey Water Addictive](https://www.sustainable.co.za/biosystems-500gm-grey-water-additive.html) on the paper promise to take care also of this, but i don't have enough historical data yet to confirm that.
### Issue number 3: what if you are out of grey water or, at the opposite, if your tank is full?
In case your tank get's full the easier thing to do is just to have an overflow output and discharge the overflow on the ground. This isn't exactly a great thing anyeway, so, having at least a sand filter for that should be a good idea too.
### Issue number 3: Costs:
Of course if you put an overflow output and a sand filter, you can also think to use the resulting filtered water for irrigation or similar applications.
Sorry, not yet written this part, i'll do shortly
In case your tank is empty the issue is worst as your toilet will not be able to flush anymore, and if you really need to do it you will have to manually switch a valvle to fill up the
toilet container with some water coming from another source, maybe even a clean and potable one sadly, or hopefully a a not-so-clean water coming from something like a rainwater thank or similar.
### Hack The Water projects to make it easier
If you like to automatize that, you will need something that will [measure the level](/post/tanklevel) and then automagically toggle the right valvles.
