the ph probe is sitting in a little contianer (the kind 35mm film comes in). I sat that on a shelf that is built into my lifereef sump. The shelf holds canister filters. Anyway, I stuffed a 1/4 line into the JG fitting that is threaded into my sump. I put a little plumbing tape on it to make it water tight, then stuffed the other end into the cup. The cup overflows and spills into the sump.
You'll rig something similar after you kneel down the first 10 times trying to collect your effluent so that you can test it. Trust me on this one.