Hello!! It's Joseph

 Corrected input data for calcium( 11 instead if 1.1 ppm) Based on Australian sparkling ale recipe, water requirements: Ca ≥ 50 ppm, Mg ≤ 10 ppm, Na ≤ 10 ppm, SO4 ≈ 75 ppm, Cl ≈ 50 ppm, HCO3 ≤ 10 ppm if no salt addition, delta is as below: Water recipe with salts added, based on 3L mash: Overall report: The delta Gypsum and calcium chloride correct calcium quite well  This combination is not perfect, but quite close  Slaked limeCa(OH)2熟石灰 more stable and soluble than chalk CaCO3生石灰 CaCl 苦鹵， 鹵碱，鹽丹（做豆製品用） Conclusion: From bruhlosophy exBeeriment , not everyone can taste the difference. So major reason seems to adjust pH for yeast to ferment.

By retrieving data from WSD HK drinking water quality report (HKDWS)   >> 2019-2020 here   NB: sodium is missing, and so take it as zero mg/L From brewers friend  calculator, Input data to brewer friend as below: Output: Brunwater

Slight foam after adding 1 g of yeast nutrients: Add some bits of yeast floating  Will test gravity, pH, and taste  Gravity 1.006 PH < 4.5 Taste with lots of hops 2 nov Continue with sugar priming and bottling  This time, for testing if yeast is not active enough, a bit more sugar, 9.2g/L, same as a Belgian Dubbel beer. This time the wort is poured out to another pot , and add sugar. After thorough stirring, then will go for bottling. This helps to have same amount of sugar for each bottle.

Specific Gravity: 1.006 Target gravity is 1.013 Add 1g of yeast nutrients. Need to re pitch yeast from yeast starter?  Or to add some more malt extract? Or both? TBD Xxc Just found that I need to add 300 to 370g of DME to adjust the gravity. This is enough to make a new batch. Adjust calculator  

Dual boiler heat exchanger  Steam boiler: 2.2L Heat Exchanger type. With pstat valve to control pressure/ temperature  Brew boiler: 1.2L Brewing temperature with PID control: sensor located in top of boiler, adjust wireless by external hand controller E61 grouphead  Rotary pump in 高配板 Bilibili Anyways, very good CP ratio. But overall performance may not be well tuned. Eg brew pressure may sometimes "hammer" once when reaching 9 bar.  They provide,as after sales upgrade, to add paddle to top of group head. This is for flow control  which is selling ~¥400，suitable for many E61 machines Btw, those GS3 clones, the grouphead handle is just a brew on/off switch only. Beware

 Tool: 3-in-1 hydrometer  SG(Specific Gravity) of water is 1.000 Measured at 4 deg c Specific Gravity conversion