Hi guys, Another new-to-brewing question (I will try to not post too much of these) - but one of the thing I cant really figure out is the boil/batch size calculation. Im looking at the recipe template here and trying to build my own Recipe but unsure with the water. I brewed a batch recently, started with 15L (4 gallon) water, mashed it and sparged until I had 15.5L (4.1 Gallon) wort, boiled it and ended up with 11L (2.9 Gallon) that I then fermented - with a correct OG and the beer turned out correct as per the recipe. Don't know how much this says about my efficiency but might be of help. My goal is to end up with somewhere around 15-18L (4-4.8 Gallon) of wort to ferment. My boilpot has a limit of 30L (8 Gallon) , my mash can take 40L (10.5 Gallon) and the fermentor 30L (8 Gallon). As I understand when I have my efficiency and correct water calculated in the recipe template, its seems quite easy to play around with the hops and fermentables to achive desired IBU and ABV. But how do I understand the water ratio?