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Astringency is from pH deviation, not fineness of grind. Big breweries mill to flour and then squeeze the grain against fine filters using air bags to maximise efficiency. I wonder how much pressure a grain bag can take and how we could best squeeze it.

Consider the kr2040ax from eBay. $17. It's basically an SSR with built in control circuitry, and come s with potentiometer to control it. You'll need a heat sink too.

That's what people thought leaving beer on the yeast until recently...

Maybe your low estimate is leading you astray. Can you really not boil 2.5gallons of sugary liquid on your stove? When i was using stove alone I was boiling around 4gal in 6gal pots. I am boiling 10gallons with 3375W in my insulated keggle. I'd be amazed if stove + 1375w doesn't do it...

Is it interesting? I'm not seeing the interest or concern. Is there a problem?

BTW insulate the kettle, we used a camping mat plus reflectix. Faster to boil and easier to maintain a boil.

I use two elements on 120V, a 1375W and a 2000W. One in the keggle, one heat stick. I bought a kr2040ac power controller ssr to adjust temp, but don't need it. I just turn one element off and the other will hold a boil for my 10gal batches. if I were doing smaller amounts then the power...

How would it? A smaller FB would have less dead space. It might make draining slower.

They're these ones Looks like I may only have one 2l, don't know where my wife has hidden the others!

Of course. I can post pictures of the actual bottles tonight, or a picture of the type right now.

I have about 15 1L EZcap bottles for sale. I would like to sell the 1L for $3 each or 6 for $15 + 2 homebrews or 12 for $25 + 4 homebrews If you want them all I will get the exact number for you. I have 2 2L Fliptops. They are the type with metal handles. Cost around $30 new, I will sell...

A silicone washer might well work better. The nut I used (for my heating element) came with a groove that traps the o-ring and compresses it. http://www.bargainfittings.com/index.php?route=product/product&path=36_38&product_id=57

Since you have 4" pipe you could put a coil in it, maybe put a sealed 3" pipe down the center to fill some of the volume, which you could also use to coil the tubing around.

Will you be making a 60' 4" pipe or run the copper back and forth using ubend fittings? Won't you waste quite a lot of water?

I was thinking that if I used plastic wheels the machining would be quite easy.

Could I use caster wheels inside pipe to create rollers?

Yes, in general but they don't metabolise BPA similarly. http://www.bisphenol-a.org/about/bpa-myths/bpa-accumulates.html

Have you cut into the wall with your cutoff wheel by mistake?

If you specified full couplers then they messed up and did it wrong and need to do it right.

BPA isn't bad for you. We know it is bad for rodents, it is not harmful to people especially adults. Rodents and people metabolise it differently. The best bit is the stuff they have replaced BPA with is actually worse for you :mug: