So, I'm a 10 year AG brewer who recently made a new manifold for his mashtun with 1/2" cpvc and installed it an the igloo "cube". I was previously using the easy masher with about 75% efficiency. Since the beginning of this new manifold i've brew 3-4 batches and my efficiency is about 55% - 65 %. I am completely confused and bewildered how this could be happening. Today i made a double IPA that was suppose to be approx. 1.097 OG and it was 1.055 OG @ 75deg when i racked to fermenter. i used 15 lbs of 2 row pale, 2 lbs 10L crystal, 1 lb carapils. That's alot of grain and my gravity was way off? Does anyone have a clue what is happening here?? I've never had a problem like this and I didn't think that the cpvc manifold would do this after all the posts I've read about how people have increased their efficiency with this manifold. Any ideas would help...Thanks.