dark wheat beer

Brew target: 75 l dark wheat beer

Malts:
    9.0 kg wheat malt
    9.0 kg munich malt

Hauptguß: 54 l (The part of the brewing water that is used during mashing)
Nachguß: 58 l (The part of the brewing water that is used for sparging)

Mashing:
    decoction: 45° for 35 mins
    first protein rest: 43° for 10 mins (45° are also fine)
    second protein rest: 48° for 10 mins
    third protein rest: 53° for 10 mins
    maltose rest: 63° for 30 mins
    saccharification rest: 73° for 25 mins
finisch masching: 76°
cooking time of the wort: 75 at least mins
hop additions:
    1. hop addition: at the beginning of the cooking 25g of Tettnanger Aromahopfen
    2. hop addition: after 20 mins 25g of Tettnanger Aromahopfen
    3. hop addition: after 75 mins 25g of Tettnanger Aromahopfen
main fermentation: 5 days at 18°

IBU calculations: http://www.maischemalzundmehr.de/index.php?inhaltmitte=toolsiburechner
Should be around 16 IBU (accordingly to the calculations)