i would like to tie the drain hose into the sewer line. it is a 3/8" drain line. the sewer line runs above the water softner. i plan on putting the hole for the drain on the top of the sewer line. what can i do to attach the drain line??

when the softener regenerates, i need to make sure the line does not pop out the sewer line.

i do not want to ru the line into the sump. it will kill the grass. i have a lagoon to use for the drain.