Rice Hulls are used to aid in filterability when you’re doing all-grain brewing with a high percentage of wheat or oats, or if you have had lautering problems. They do not impart any flavor to the finished beer. Use at a percentage not greater than 5% of the total grain bill. Typical dosage is 1/2 lb in a 5 gallon batch.
I use rice hulls every time in my keggle mash tun when brewing 11 gallons batches. It not only works for avoiding a stuck sparge, but it is absolutely golden for regulating and keeping a consistent temperature in your mash tun, as you recirculate during the mash. It helps to keep the temp consistent throughout the entire mash tun so the temps are even from top to bottom. I use 1/2 pound of rice hulls for every 5 gallons of beer being brewed. Great stuff!
I throw some in to the mash as a preventative measure even when not using wheat sometimes. I'll also use it in my hopback if I'm not making a beer that calls for it to get some extra filtration before the chiller
No flavor difference in the beer, spent grain bread and pretzels taste the same, no strange texture. As little as 2oz can really help lautering any beer, but they're really great for wheat and rye beers. They weight hardly anything so 1lb is 2-3x bigger than a pound of grain.
I use 8 oz in every five gallon batch to prevent ANY stuck sparges. After I vorlof, I can run my valve wide open and NEVER have a problem. After dealing with a stuck sparge once or twice, I consider it money well spent, and I enjoy a smooth brew day!
I always use these whenever mashing with high oats or wheat on the bill. Works great and typically I'll put them in with my foundation water and haven't had any issue with them even with mixing and aggressively stirring as I add more grain and water.
I make 12 gallon batches in a Keggle and it is required to use these. I use 2 lbs for a 12 gallon batch have no problems. If you were to make a wheat beer using more than 30% wheat I would think about using more.
Whenever I brew a wheat beer I always use some rice hulls. My first wheat beer I brewed 7 years ago, I did not use rice hulls and it took me forever to collect enough Wort to boil. Rice hulls saves time and increases your Lauter.
I typically use this in product where I know I might have a lot of problems with my mash. For example I last used this when I threw a whole roasted pumpkin and sweet potatoes into the mash for a pumpkin beer. I also use this whenever I have oatmeal in the mash. It works, I've never had a problem.