Drain Size for Backwash Filter and Water Softener

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lancelot18

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Good day and thanks in advance for your help.

I am in the process of building a house and I plan on putting a backwashing filter and water softener into my plumbing system. I am sizing the system for 24 gpm continuous flow rate (to handle a shower my builder calls "the car wash"). I completely understand and believe I have properly sized the pressurized side, but I am having trouble with the drain side (as reading the code gives me different answers).

For background, I wish to install the following two filters:
https://www.uswatersystems.com/us-water-backwashing-catalytic-carbon-filter-1-5-inch-10-30-gpm.html
https://www.uswatersystems.com/us-water-1-5-inch-single-tank-water-softener-nxt-meter.html
https://www.uswatersystems.com/us-water-1-5-inch-single-tank-water-softener-nxt-meter.html
Both systems will be sized for the 24/25 gpm option. Pressure will not be a problem as I am on a municipal system with a 1-1/4" supply and I am willing to put a pressure booster in front of the system if required. (I need to get pressure readings before I decide to include that component.)

My question is: What size drain do I need? Specifically, what size stand pipe and what size p-trap? Will a 2" stand pipe be sufficient for these backwash flow rates?

The outlet is 1-1/4" for both, but these will be under pressure.

Again, thank you for your help! Any assistance is greatly appreciated as I prepare to talk to the builder.

James
 

ditttohead

Water systems designer, R&D
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This question is a little more involved than a simple cookie cutter answer. I sent you a pm. Your system design is not ideal for a residential application. Since the majority of your flow rate will be well below the systems recommended minimum flow rates...
 
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