Search found 123 matches

by Silver_Is_Money
Sun Jan 05, 2020 9:39 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

I'm no mathematician but that looks complicated in the extreme so for every 1 eq of alkalinity 1 eq of lime will only neutralise 1 - 1/3.5 equivalents so to neutralise 1 eq of alkalinity we get 1 / (1 - 1/3.5) which = 1.399972 as the multiplicand for the quantity of lime I like it. Same answer. I j...
by Silver_Is_Money
Sun Jan 05, 2020 7:54 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

Fascinating, but brain aching stuff! Reminds me of why I loved chemistry at school, but could never get on with higher mathematics. Dare I ask, what do you do in real life? Guy Retired. 42 years in the chemical industry. Much of it as a scheduler and then as a buyer/planner. Now I finally get to us...
by Silver_Is_Money
Sun Jan 05, 2020 7:36 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

If anyone is interested, here is how I came up with 0.618 grams of Ca(OH)2 as the pH raising equivalent of 1 gram of baking soda: MW of Ca(OH)2 = 74.09268, so therefore the Eq Wt of Ca(OH)2 = 37.0463 (due to the charge or valence of 2) MW of NaHCO3 = 84.0066, so its Eq weight is also 84.0066 (since ...
by Silver_Is_Money
Sun Jan 05, 2020 5:47 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

adding slaked lime to a water that already has a high level of alkalinity will induce the process of calcium carbonate precipitation and the rate at which this proceeds does not seem to be a constant so the expected alkalinity may well be lower than that expected. I can definitely see this as a con...
by Silver_Is_Money
Sun Jan 05, 2020 5:03 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

Part of the problem with Bru'n Water may be that (from memory) it calculates that within the mash adding about 0.55 grams of Ca(OH)2 should yield the equivalent in mash pH raising effect as for adding 1 gram of baking soda. I've computed (as stated on the previous page) that the need here is for abo...
by Silver_Is_Money
Sun Jan 05, 2020 3:59 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

I have come across a number of breweries brewing Russian Imperial Stouts using a double mash system. Two of these breweries knew that they needed an alkalinity of at least 300 ppm for the first mash. In attempting to raise their liquor alkalinity from ~200 ppm to 300 ppm using slaked lime and follo...
by Silver_Is_Money
Sun Jan 05, 2020 3:48 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

How does Graham's calculator rely heavily on Calcium Carbonate, please? In all the time I've been using it, not once has it asked me to add Calcium Carbonate. Guy Perhaps I've missed something. What other alkalinity raising chemical(s) does it offer to achieve raising alkalinity? Have you ever need...
by Silver_Is_Money
Sun Jan 05, 2020 2:58 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

Reducing the alkalinity of highly alkaline source water via slaked lime treatment, and lowering mash pH via the same are two distinctly different subjects. In the mash calcium hydroxide both raises and lowers mash pH simultaneously. The Ca++ calcium ion component complexes with malt phosphates to li...
by Silver_Is_Money
Sun Jan 05, 2020 11:57 am
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

Only one thing to add to the excellent advice above; Graham Wheeler's water treatment calculator on here is excellent. Takes a bit of practice to get used to it, but it does everything you need. Happy liquoring! Guy Indeed it is excellent, and there is undeniably nothing else like it, but it has a ...
by Silver_Is_Money
Sat Jan 04, 2020 7:49 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

Applying method #1 to the OP's analysis numbers (plus the implied 33 ppm alkalinity, which equates to 40.3 ppm bicarb) one gets: TDS ~= 28 + 11.6 + 23 + 27 + 40.3/2 (+ 3 ppm as a pure guess for all other stuff such as potassium, iron, fluoride, nitrate, etc...) TDS ~= 113 If a budget TDS meter gets ...
by Silver_Is_Money
Sat Jan 04, 2020 7:27 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

Real TDS is a process of evaporation and weighing what remains behind for a known starting volume of water. Two rough "ballpark" alternatives are: Alternative Method 1: --------------------------- ppm TDS ~= ppm Ca + ppm Mg + ppm Na + ... (sum of all other minor cations ppm's) + ppm Cl + ppm SO4 + p...
by Silver_Is_Money
Sat Jan 04, 2020 12:52 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

PeeBee, I'm struggling to determine your point here. We can only base things upon the analysis that the OP has provided us to work with. Is your point that the OP's analysis is likely to be totally bogus, based upon large differences witnessed between your own water authority provided analysis and a...
by Silver_Is_Money
Sat Jan 04, 2020 12:06 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

I don't know why "calcium" isn't tested for explicitly (or "Magnesium"), perhaps someone will explain (to answer curiosity), probably because it is difficult to return a concise figure? The private analysis I had does have specific figures, perhaps I should treat them with suspicion? Anyway, with s...
by Silver_Is_Money
Sat Jan 04, 2020 11:43 am
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

Your regional water authority likely adds chlorine and/or chloramines as biocide agents. To get rid of these you must add 1/4 of a crushed Campden tablet to every 20 Liters of your water and stir to dissolve. The removal effect is rapid. There is no need to wait any period of time after this treatme...
by Silver_Is_Money
Fri Jan 03, 2020 9:21 pm
Forum: Brew in a Bag
Topic: Ro or tap
Replies: 200
Views: 11260

Re: Ro or tap

If your calcium is 28 mg/L (ppm) and your total hardness is 70 mg/L (ppm), then your magnesium ppm must be zero. Molecular Weight of CaCO3 = 100 Molecular Weight of Ca = 40 Molecular weight of Mg = 24.3 100/40 = 2.5 100/24.3 = 4.12 Total Hardness (as CaCO3) = 2.5*Ca + 4.12*Mg 2.5*28 = 70 = your tota...