dual water tanks

Are you talking about under floor (caravan perhaps?) style water tanks? You haven't given us much info to go on......

In some ways it is best to keep your water tanks separated in such a way that if you hole one, you don't lose all your water.

The other issue is cross contamination, if you get a bad batch of water in one tank you cannot isolate it. Best to leave them independant of each other. Cheers ERic.

Hi Noldi,
If you valve the line from each tank going into a tee piece separatley and simply open the valve to the tank you want (and close the valve to the other tank), then the two tanks are isolated from each other. If you then use a self priming pressure pump, you only need the one pump for both tanks. In other words, hoses from each tank into a valve then to a tee piece, from there a single pipe to the pump. I use this in my caravan with the change-over valves in the cupboard under the sink - it works well.

If you are using an in-line pump, you could do the same, but the valves would be at each tank (could be awkward) and the pump needs to be low enough to ensure they are always below water level.

If you use 2 pumps, then it gets even trickier as you will need to have some sort of electrical changeover to make sure the correct pump is energised, depending on the tank you are using.

Hope this makes sense...
Cheers
Gerry

Ian

If you are going to use a T piece and a common supply line then you are not really isolating your tank in regards to contamination. Your contaminated water will be in the line you are going to pump your clean water through.

The best way to get isolated systems is to keep have two separated systems. This will include 2 separate fillers as well.

Keep one tank for fresh water and fit it with a hand pump. If you want an electric pump on this system you use an in line bilge pump not a submersible one (so you do not have to open the tank to put it in.)

The other tank supplies the high pressure system. Use a 12V pressure pump and non return valves to couple the second tank to the HP tap. If you wish to use town water for drinking you simply connect the town supply, switch off the pressure pump and run enough town water through to flush the system.

PeterD

Hi all,
thanks forthat certainly brought up some points I had not thought of, out with the pen and paper and draw it out first I think

Rgds
Ian