Fine tuning an MLT manifold

[ImperialStout]

Main question is how deep to cut slots and if drilling holes would improve efficiency. Just built and tested a copper manifold for a 10 gal Igloo cooler. Works great but leaves 2 cups behind.

Cut slots in bottom of manifold, some about half way through, some just until the hole starts to appear. How deep do you cut your slots?

Since draining is a siphon action and air will end the siphon, wondering if cutting slots too deep will decrease efficiency?

Since holed would be just on the very bottom, wondering if drilling holes would increase efficiency. Thinking of making another o manifold but drilling 5/32" holes, 3/16" on center, or what ever the standard spacing is for a false bottom.

Anyone drill holes? What has been your experience?

Also, I soldered some connections. What do you use to clean up the copper from the effects of the flux?

 

[JRems]

I cut slits about 1/3 the way through the copper. It will drain until there's just a few tablespoons of water. Did you have a couple foot long hose on the ball valve to create a siphon? Post pics of your design it shouldn't leave much water behind, or the bottom of the cooler is not flat leaving extra water behind.

 

[ImperialStout]

Yes, had a hose attached to the ball valve. First time I didn't and it left 8 cups in the cooler. Think the problem is the cuts are too deep, allowing air to enter sooner and leaving 2 cups behind. May build another one with drilled holes and see what happens.

 

[wilserbrewer]

Realize that the two cups left behind is mostly grain and little wort...I would not be concerned over the 1/2 cup of potential beer...just my .02

 

[ImperialStout]

Thanks. Right now I am just testing with water. Grain will make fluid loss a minimum.