Rain water harvesting low pressure.

[Skye]

I have been contacted by a client who has low outlet pressure with a new rainwater harvesting system incorporating a storage tank serving two wc's and an outside tap.the property is single story with 15 mm supply.
I haven,t visited it yet so not quite sure of the set up,and havnt delt with this before.would like to have some idea before I get back to them.
am I correct in thinking the outlet is just gravity fed? If so this would explain the half hour to fill the cisterns.
Can a pump be fitted to the outlet,ie single impeller shower pump or is there anything on the market that would be suitable.thanks in advance.

 

[unguided1]

rain water harvesting tanks are normally underground and then have a pump to get the water into the property it is possible that the filters may be blocked if it is a new install, or if the water from the harvester is pumped to a storage tank in the roof there may be a blockage in the ballvalve

 

[justlead1]

Hi. If gravity feed? Check the size of the orific in the ballvalve (probably high pressure left in them)

 

[unguided1]

Hi. If gravity feed? Check the size of the orific in the ballvalve (probably high pressure left in them)

Nice one I forgot that

 

[Gray0689]

rain water harvesting tanks are normally underground and then have a pump to get the water into the property it is possible that the filters may be blocked if it is a new install, or if the water from the harvester is pumped to a storage tank in the roof there may be a blockage in the ballvalve

I'd go with this advice never saw a gravity one but could be wrong

 

[Skye]

Thanks for the answers so far,filters and ball valves would be my first point of call,
Main question as it's only a bungalow max head available is .3 bar ,it is pumped into the tank with mains feed back up,gravity fed outlet to below,
Is there a possability to fit a pump on the outlet.

 

[unguided1]

As it is a bungalow then I would say justlead1's answer is spot on regarding ball valves.
If the taps in the property have been changed it could well be that they are high pressure taps on a low pressure system.
yes you can use a pump to raise the pressure if you wish

 

[pobsdad]

The drinking water (kitchen) should be on mains,so ought to be high pressure.

 

[jeckysmith]

Rainwater falls on the roof of houses is soft and largely free of microorganisms. Rainwater tanks are installed on the ground to store rain water and the stored water can be used for commercial purposes. I want to install rainwater filters to make rainwater free of impurities.


rainwater filters

 

[unguided1]

Rainwater falls on the roof of houses is soft and largely free of microorganisms. Rainwater tanks are installed on the ground to store rain water and the stored water can be used for commercial purposes. I want to install rainwater filters to make rainwater free of impurities.


rainwater filters

I bet yer filters cant do anything to prevent Dyhydrogen Monoxide its awfull stuff and should be banned

 

[Toddyplumb]

The tank already has a pump on the outlet (or should have !) it will either
a. Feed the WCs and outside tap at high pressure (direct system)
b. Feed a starage tank in the loft which then feeds the WCs and outside tap (indirect system)

Identify the system and start from there.
Check the Air gaps while you are there and the pipe labelling !