Your thoughts...twin fluidmasters in the same cistern...

[plumbskill]

Andyparry, you obviously know your water regs, but please explain to me why, when fitting an outside tap for a hose pipe etc. the only requirement is to have a double check valve fitted.Surely, there is as much risk with this as there would be if you were pumping rainwater into the house, as some of the guys are trying to do.

As i have mentioned on a previous post, the reason for having a check valve on an outside tap [for example] if you were topping up a fish pond, and the mains burst in the road or the water company were tapping into the main, there would be a chance of syphoning your pond water back into the main, that would contaminate it.

I personally would do the same as the guys are doing, just because it says so in the book, does not always make it right. A lot of what you read is down to interpretation. A bit of cheap bleach poured into the water butts would kill the bugs anyway, as long as it was only used for toilets, and would also keep them nice and clean.

another little known fact is that the mains water stopcock [not gate valve or any other type of isolation valve] is also a check valve to a certain extent. Water will only flow through it one way [hence the arrow for direction of flow]
It is designed so that incoming mains water has to lift the "jumper" the bit with the rubber washer. When there is no mains water being drawn, the jumper and washer will stop backflow if the main in the road bursts etc.

[Paulh_Boats]

Is there a scientific analysis of the risks backed up with statistically valid health data?

I find the weir, check valve, tank, rainwater thing a bit OTT.  We can be sure that more people drink themselves to death with alcohol than those that die from rainwater. QED.   


We've hand watered our veggies for years with rainwater from a water butt full of a warm soup of bugs that thrive in summer temperatures. Elf and safety gone made again.

-Paul