Final preparations before the liner is put in place. Dig out is 7 wide by 13 length depth is at 3 foot. Settling chamber is 5 length by 4 wide 4 feet Depth. This leads to a 2x2x3 depth bio with 4cf of k1/ bioflow MBBR. Pump to tpr’s is a reeflo hammerhead/barracuda hybrid.
I have a couple of uncertainties:
size of bottom drain pipe I believe I need 2 total cause of the length, but should I go with double 4” or double 3” drains?
With the determined size drains settling chamber pre-filter will be bactitwist filled pot that flows to bio chamber. Should this be 4” pipe or double 3” or a full 6”, to prevent risk of flooding or drawing down in excess? Bottom drain cutoffs will consist of applicable stand pipes.
The remainder of the sketch involves existing 1700 gallons with proposed double retro drains suction pulled by reeflo hammer/head, priming pot to a 4foot by 16foot bog. Skimmer is a no-niche flow to double phoam phractonators. This is for another post, but wanted to include since this is contained in the sketch.
Any advice on the plumbing would be greatly appreciated as well as any further advice on the over all.