[Tim Schultz]

Tim Schultz  asked the Naked Scientists:
   
Chris: I am trying to heat our pool using the the existing circulation system.
 
I have attached a 1" hose from one of the outlets in our swimming pool circulation system. I ran about 100' of 1" pipe along side the pool and the temperature rose about 3degrees f. the water is coming out at the top of the water level at 8 l per minute. I want to add 200' more to the system but am afraid the back pressure will reduce the flow rate. Will lowering the pipe 4 feet to the bottom of the pool create more flow and vacuum pressure even though it is being submerged in the 4 feet of water?
 
Tim

What do you think?

[SteveFish]

Tim:

No.

Steve

[Geezer]

I'd agree with Steve. The reason it won't make any difference is because the effect of the downhill flow will be cancelled out by the effect of the uphill flow.