seems like a lot to lose to trub and hops. Is it deliberate to absolutely minimise trub etc into cube/FV, or just something you live with? Must admit I try to recover most of the wort and the trub heavy stuff at the bottom of the BM is often strained and reboiled and either used for a starter or tipped into the cube. Even if I don't do that, losses to trub are a lot less than 4L - mind you, given I can rarely be bothered bottling the last litre or so of beer still int he FV once the keg is full, its kind of dumb I guess