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Hey Steve. What were your OG and FG readings? These will help alot for offering advice. Your water to grain ratio does sound a little high. Common ratio's tend to be somewhere between 2.5L per kg and 3.5L per kg. I usually use around 2.8:1. Having a slightly lower ratio frees up more water for sparging, which usually gives a better efficiency as more sugars are rinsed out with the larger sparge volume. There are also other factors that could have played a part, such as your grain bill, your final gravity etc
That would be your problem. 57 is a very low mash temperature, barely warm enough for Beta Amylase to work. The normal mash target it 65-67, but you'll still get good results at temperatures slightly outside that range. 'Watery' is generally a problem associated with lower mash temperatures.
Check out the All Grain section of How to Brew for a detailed explanation of mash temperatures.
Alec
That link Hutch provided is a must read and it walks you through what's happening to your mash at each temperature range, grain-water ratio's and pretty much everything you need to know about mashing. Reading that is your best bet. If your using a single infusion mash then there is no difference in mashing a pilsner from an ale or any style really, apart from varying mash temperatures to manipulate yeast attenuation.
Like Hutch said, your mash temp is a little too far out of the range for full conversion. For a highly fermentable wort, the lowest I would personally go is 64c
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