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Bugger, that's no good. How does the grain taste when you chew it? Is it nice and crunchy? What type of malt is it and long did you boil for and how fast did you cool?
The only thing in common? Were you using the same fermentor? Could it be an infection somewhere in the fermentor that is not being cleaned out? If it is a plastic fermentor with a tap near the bottom then check that you are taking the tap apart.
Mould in the brew room will mean your brew is more likely to get an infection as there will be spores floating around. Get some dilute bleach in a spray and give it a clean.
If the malt tastes fine when chewing on it, then I would think it is more likely to be a something in your brew process.
Can you give us a bit more information? I take it you do all grain - are you BIAB or using a mash tun? Did you check the pH of the mash, how do you cool your wort and how long does it take, are you reusing yeast, making a starter or just sprinkling dry yeast straight in. What are you using to clean the fermentor, what do you use to sanitise the fermentor. Are you bottling or legging?
Ah, sounds like you have it sorted. Are you breaking down the plate chiller to clean it?
Gladfields pale malt can tend to have a high pH when mashing - which may contribute to the change in flavour? Probably worth checking the pH of the mash as well?
Looking back at your flavour descriptor: grassy/musty brings hops to mind. Did you use a decent amount of hops in any of these beers? If so did you dry hop and how long for and at what temp?
Cool, how long did you have the dry hops in for?
Also how did the hops smell in the bag? The telltale signs for me are cheese + cardboard - if you smell any of either then the hops are no good.
I would tear it all down and give everything a good soak in cleaner then sanitiser, then do two quick batches, one smash with golden promise first then a existing gladfields smash
simple smash beers about 5% with clean nz hops, no dry hop.
I would go mot and riwaka but what ever, get new hops from a difference source.
In 10-14 days you will know if you have cured it, consider syphon hose replacement etc got to think anything involved in transfer process could be infected.
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