I have done about 75 batches with my current igloo 10gal cooler. When I clean the false bottom, the cooler gets scratched. I noticed there are new false bottoms with a rim on them to prevent this.
My question is whether all the scratches I’ve accumulated cause an issue? I’m getting good efficiency, so I don’t think I have tunnelling water during the sparge. Am I carrying flavors over from one beer to another? Risking contamination of some kind (yes, this is pre-boil) ?
To be clear, this is a 10gal round cooler and I am running 5gal batches of all flavors.
Mine has a few scratches, too. If it were a bucket, there might be some merit in replacing (though I think the risk is overstated). But this is preboil as you say - no risk of contamination, and if you rinse the cooler out thoroughly after brewing, no risk of carry over. No worries.
A few scratches in the mash tun won’t hurt a thing. Whatever may lurk in the scratch will be boiled for an hour so you should have worries. There isn’t likely to be enough of anything in a scratch to cause any carry over flavors either. Definitely in the relax, don’t worry category.