Is 60 ft. To far to run a gravity fed bottom drain line to an rdf or is shorter better as far as line clogging and flow ?
Is 60 ft. To far to run a gravity fed bottom drain line to an rdf or is shorter better as far as line clogging and flow ?
If you decide to do it I would install one of these half way with a stand pipe.
member
For gravity flow shorter is always an advantage for flow and clogging concerns. You also need to add in the resistance of all pipe fittings on the 60 feet of pipe. 60 feet of pipe plus fittings resistance can easily turn into 90 feet equivalent length. A 4 inch pipe 90 feet long can flow 4,000 gph with 3 inch drawdown in the filter. This will be in addition to the RDF normal drawdown due to screen resistance.
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If flow rate is high enough to RDF and you occasionally purge it....not need for the pipe to clog. But if the flow rate is slow, you can indeed create a settling chamber.
Depends on your flow rate (draw down at RDF). I have two 4" BD lines running to an RDF and one 4" skimmer line. The skimmer line is 70 feet from the filter, one BD is 60 feet and the other 50 feet from the filter. Each line is heat-bent until just before the filter where each has two 90 degree angle fittings.
They have been running for over 10 years with no problem. Last January when I installed the RDF, I had to cut each of the lines to adapt them to the new filter setup and was surprised that each pipe was relatively clean inside with no carpet algae like on the pond walls. As a guess, I flow around 3500 to 4000 gph through each line.
Avorancher how hard was it to heat bend 4 inch pvc ? im using schedule 80.