Sorry I did not say it right.
Vertical 10" pipe connected to 1.5" ptrap. At the top of 10" air gap adapter.
I used CHARLOTTE PIPE 1 1/2 DWV P-Trap with Solvent Weld Joint DWV connection. It has single nut on water slip joint.
Thinking of redo 3/4" hose.. Get 5/8" adapter to may barbed 1/2" and...
Need some ideas how to address this issue with water back spillage [~1/4 measuring cup].
Have GE 44k[Not ideal, but it works..] water-softener on city water - plumbed with 1" copper lines. Drain outlet is 3/4" garden house -7' long to 1.5" air drain gap adapter above the softener.
This drain...