I have a small tupperware type container attached to my sump wall. When running sumpless,
, I use a large shotglass, attached to the overflow eggcrate with a tie wrap.
For measuring effluent amount I used a smaller measure cup type thingy. I cant remember when I measured the effluent rate last. Dont bother anymore as it never made much sense to me.
I just set it at a fast drip, close to a stream and adjust the bbm accordingly. I then measure the effluent alk. and ph.
I,ll move this to the general forum for you. Likely more answers there.