[Przemek Jersz]

hello everyone, I'm very new to window cleaning and just about to start doing my first round next week, i have a question about the water pump , when the pump is on but my water flow closed can i keep it like that for few minutes or is it bad for the pump? hope that make sense
thanks

[andyM]

As long as your pump has a pressure switch fitted or you have a flow controller with dead end detection in your system it will be fine. 

[Przemek Jersz]

thanks andy
i tried to look for the same controller online but no luck, how ca
n i find out?

[andyM]

Here's a selection of some of the flow controllers available to buy:
https://www.google.co.uk/webhp?gfe_rd=cr&ei=oXfCV7jqLrTH8Afcr4XoCw&gws_rd=ssl#q=wfp+pump+controller&tbm=shop

Although some people use a more basic system that have just an inline on/off switch between the battery and pump (with pressure switch).   

[Matt.]

Answer is yes it will be ok

Surflo pump is prob best bet to use, once pressure has built up the pump cuts out til the water is able to flow again then kicks back in.