running 2 filters in parallel.

[ChicoRaton]

Lengths of pipe (ESPECIALLY flexible tubing) slow down flow a good deal more than you'd think. For that long of a run, I'd go with 1" tubing, tee'd and reduced to 1/2" as close as possible to the filters. Even that is going to impede the flow a little. Minimize bends in the tubing and keep it as straight as possible.

 

[DarkSoul]

bends would all be handled with elbows, which should keep things just slightly smoother than bending the tubing.

the larger tubing would be reduced to 1/2" basically, right at the filter.

Im thinking now, if i used larger tubing on the intake, and kept the outlet tubing all 1/2", the weight of the water pushing in on the input, should keep a good bit of pressure built up, which may help the outlets keep pressure up to push the water through all that tubing.

My thoughts, mostly, are that if i use larger tubing on the outlet, then the sheer weight of the water pushing back on the filter, will reduces its flow. but if i use 1/2" tubing on the outlet, it wouldnt be putting as much back pressure on the filter, from the weight of the water.