Newbie plumbing question. Any reason to go from 2" pipes to 1 1/2" (don't have any choice) and then back to 2" ?

[micheldb]

Hi, we have to change our filter and salt cell unions so I need to change some of the plumping (inground pool).

I'm going to go from the pump to the filter using 2" but then from the filter it goes to the roof and our solar heater which is all 1 1/2" (and I'm not going to replace it) and then from the roof (1 1/2") it goes to the salt generator cell which then splits and goes to the 2 jets in the pool. Once it comes back down from the roof, is there any value going back to 2" through the cell and then to the split (which will be 1 1/2 again afterwards). The pool return line is 2" from the skimmer to the pump. Or should I just do 1 1/2 from the roof solar and on ...

Let me know what you think. Thanks,
Mike

(In case it makes any difference, Intelliflo VF pump, Hayward C3040 cartridge filter, Jandy Aquapure 1400 salt gen. 16x32 inground pool maybe 7-8' deep end - maybe 20k gallons (I'm really not sure))

 

[Texas Splash]

Once it comes back down from the roof, is there any value going back to 2"

I'm going to say no, but @mas985 is one of our hydraulic/solar experts, so let's give him a chance to look over your situation and get back with you. Stand by ........

 

[mas985]

Short sections of 2" aren't going to buy you much and in fact might be negated by bushings if used so I would not be concerned about it.

 

[1poolman1]

Hi, we have to change our filter and salt cell unions so I need to change some of the plumping (inground pool).

I'm going to go from the pump to the filter using 2" but then from the filter it goes to the roof and our solar heater which is all 1 1/2" (and I'm not going to replace it) and then from the roof (1 1/2") it goes to the salt generator cell which then splits and goes to the 2 jets in the pool. Once it comes back down from the roof, is there any value going back to 2" through the cell and then to the split (which will be 1 1/2 again afterwards). The pool return line is 2" from the skimmer to the pump. Or should I just do 1 1/2 from the roof solar and on ...

Let me know what you think. Thanks,
Mike

(In case it makes any difference, Intelliflo VF pump, Hayward C3040 cartridge filter, Jandy Aquapure 1400 salt gen. 16x32 inground pool maybe 7-8' deep end - maybe 20k gallons (I'm really not sure))

Does it work well now? If so, why change? With the use of a VSP, many of the advantages of increasing pipe size have gone away as we can customize the flow we need. If your underground piping is 1.5," what you do above ground for that little bit won't change much if anything.

 

[micheldb]

Does it work well now? If so, why change? With the use of a VSP, many of the advantages of increasing pipe size have gone away as we can customize the flow we need. If your underground piping is 1.5," what you do above ground for that little bit won't change much if anything.

I have to change the filter and the salt cell (old style is no longer made and new style uses bigger fittings so can't use existing ones) so need to change some of the plumbing. Pool guy that replaced my skimmer last year said that I should use 2" between the pump and filter.

 

[1poolman1]

I have to change the filter and the salt cell (old style is no longer made and new style uses bigger fittings so can't use existing ones) so need to change some of the plumbing. Pool guy that replaced my skimmer last year said that I should use 2" between the pump and filter.

You can use 2" wherever you like. If I change all the equipment (pump, filter/pump, filter, heater) I will always use 2" because that is what modern equipment uses for plumbing. Less glue joints as there are no reducer bushings involved except at the plumbing coming out of the ground.