Hi Guys! I suppose I should start by introducing myself first, I'm Tom, I''m 22 and I've been brewing only for around 8 months but have loved beer since I was allowed to drink. I've done a few nice all grain brewings on the kit I initially set up (a BIAB keggle) but I've been investing a little more money recently and have now assembled myself a 3 tun set up, with pump, whirlpool ports, camlock connectors etc.. So, I did my first brew on the 3 tun set up around 3 weeks ago, a chocolate milk stout recipe of my own creation. The beer itself turned out very drinkable and is currently sat in my corny keg ready for me to drink whenever. That being said.. I did not hit anywhere near the OG or FG intended, and the beer only ended up being around 2.8% ABV (4.6% was intended). Intended OG was 1.056 and I got 1.042. I also did a brew of a NEIPA two days ago, intended OG was also 1.056 and I got an OG of 1.042 again but the other issue was.. I got only 14L in the fermenter on this brew whereas I got 24L from the milk stout. Grain bills on both recipes were similar (5.8KG and 6.2KG respectively) but the hop bill on the NEIPA was considerably higher than the stout, but surely that shouldnt be enough to lose 10L? The mash tun i'm using is a converter 42LTR cooler with bazooka filter as the "false bottom", could the gravitity issue be caused by this? Should I invest in a proper full false bottom? I am pumping my wort to the kettle via the tap and pump, when the pump sounds like it is running dry I stop pumping, would it be worthwhile to pump until in sounds dry, then allow the water to settle to the bottom and then try pumping again? (In case I'm missing a certain amount of water from the grains) I appreciate all your help, the forum looks great and I hope to be active on this forum as I am on other forums. Thanks guys!