Increasing existing pipe diameter ??

[brent.roberts]

Thanks for the comments Chis.

I am thinking that I will try to slip a 3" pipe over the 1 1/2" and put an adaptor on the end for the garden hose and then try to force it down and along the old 1 1/2 inch, flushing the sand as it goes. If it encounters any clay or rocks I'll be
SOL and have to invoke plan B which is what you suggested.

I think this must be a pretty common problem with people that get undersized systems to start with. One would think that someone out there has a solution.
Gee if they can tunnel under the English channel to France ......

[SteveK2]

I wouldn't necessarily conclude that a pool with 1-1/2" piping is 'undersized'.

That conclusion would have to depend on the variables at hand -- number of return lines, number of skimmers/main drain, size of the pool, length of the piping, etc.

Pools with a larger number of intakes and returns might very well be 'right-sized' with 1-1/2" piping.

[haze_1956]

Seems to me that it matters what the pipe diameters are where they combine and split.

Two 1 1/2" pipes that Y into a single 1 1/2" pipe is going to have less flow that if they Y into a 2" pipe.

So if your skimmers and returns pipes combine into like sized pipe, you could replumb larger diameter pipe between those junctions and filter, and should see more volume.