Hayward SP1408 vs SP1411

[GrayGeek]

Greetings!
This winter I plan to add an inlet line and a return line to my inground vinyl pool. My problem is that I cannot figure out if I should use the SP1408 or SP1411.
I have looked on Hayward's site and searched the Interweb for an SP1408 vs SP1411 and found nothing helpful other than the Hayward install PDF which indicates they are both compatible with a pool like mine.

I would greatly appreciate help with this, even if it's just to tell me I am worrying about nothing.

Thank you!

 

[Jimrahbe]

Gray,

You can't add an 'inlet' line to your pool. Or maybe better, you can't just stick any old pipe opening in the sidewall of your pool.

Inputs to the pump must have protection that prevents someone from getting stuck to them by the suction. This is why new pools have dual drain covers. You would need to do something similar with any side wall return.

Do you plan to add a pump? You can't really have a pump that has two difference sources of water at the same time.

What is your goal for adding new input and output plumbing??

Thanks,

Jim R.

 

[GrayGeek]

I already added a new pump. It's the Hayward TriStar Variable Speed Pool Pump, 1.85 THP.
Yes, I know I will need to add an SP1026 to whichever of the return inlets I end up using.

This is an old pool (1970's) with a 2 year old liner. They are two 1-12 inch lines supplying the pump and one 1-1/2 line for the return. This makes no sense to me; seems out of balance and certainly does not supply the GPM I would like.
Add to this; when they replaced the liner they eliminated the drain in the deep end. The previous owner of the property (we bought in Jan of this year) was told that the installers could not ensure it would not leak.

If you look at the attached drawing SW-PW-001 you will see that the two intake lines are fed from the skimmer and what I think is an SP1408 a couple of feet from the skimmer and about 18" off the bottom of the pool.
The single return feeds what appear to be two SP1408s on the opposite side of the pool from the skimmer. My plan (drawing SW-PW-003) is to split the two returns at the TEE they share; add an additional return on the skimmer side of the pool in the deep end, and then an intake on the wall at the deep end of the pool. Thus balancing 3 intakes with 3 returns.

I am waffling a bit on the idea of having 6 1-1/2 inch lines in total running between the pool and the pump. It strikes me that it might make more sense to use 2-1/2" PVC to run to/from the pump/filter setup and then use manifolds near the pool to break out the 1-1/2" lines. It would be cleaner at the pump/filter equipment, but maybe more concrete cutting and digging for me.

Thoughts?