I agree with lack of temperature control is a big issue here. Massive underpitching has got to be part of the problem too.
Per Mr. Malty's yeast pitch calculator (love it or hate it) 15 gallons of a 1.048 OG beer needs 505 billion cells.
Unless these beers are infected, those two issues would be the first to tackle. If they're infected, the sanitation needs to be improved first, then the temp and pitch rate.
Per Mr. Malty's yeast pitch calculator (love it or hate it) 15 gallons of a 1.048 OG beer needs 505 billion cells.
Unless these beers are infected, those two issues would be the first to tackle. If they're infected, the sanitation needs to be improved first, then the temp and pitch rate.