I currently have one 400 gpd membrane and two 150 gpd membranes. The outlet of the 400 gpd is 1/4 which wells because the inlet for the 150 gpd is 1/4.

I am going to be replacing the two 150 gpd with a second 400 gpd. The inlet for the 400 gpd is 3/8. The outlet of the first 400 gpd is 1/4, do you just get an adapter quick connect firing that goes from 1/4 to 3/8 to feed the input of the second 400 gpd membrane?

One last question, is there any value in keeping one of the 150 gpd membranes to have three or would it just slow everything down?