Search found 94 matches

by Carnot
Wed Oct 14, 2020 10:20 pm
Forum: Brewing Liquor
Topic: How accurate are ph indicator strips?
Replies: 18
Views: 530

Re: How accurate are ph indicator strips?

Quick answer. Not very accurate especially if the sample is coloured. Be very careful with pH meters. A pH determination is really only applicable in aqueous solutions- that means water. Once you have significant organic material the result is not necessarily accurate. The killer for pH probes is th...
by Carnot
Wed Oct 14, 2020 8:34 pm
Forum: Cleaning, Sanitation and Sterilisation
Topic: Residue on PET yeast bottle and fermenter
Replies: 8
Views: 611

Re: Residue on PET yeast bottle and fermenter

I would not hold your breath on this concept of >5.5% alcohol being a sanitiser. If you wish to preserve foods or other organic matierals then 5% alcohol is not going to get you very far. Why do all the Covid santisers require 70% minimum alcohol ( ethanol and isopropanol). You might like to review ...
by Carnot
Wed Sep 23, 2020 11:33 pm
Forum: Cleaning, Sanitation and Sterilisation
Topic: Residue on PET yeast bottle and fermenter
Replies: 8
Views: 611

Re: Residue on PET yeast bottle and fermenter

I think that your problem lies with the PBW which is a mix of sodium percarbonate and sodium metasilicate. This will raise the pH and combined with your hard water it has possibly caused carbon dioxide to react with calcium ions and precipitate. The long soak is the problew. I have never been a fan ...
by Carnot
Thu Dec 19, 2019 11:07 pm
Forum: Mead
Topic: New Year's Mead
Replies: 1
Views: 1616

New Year's Mead

As not much is posted on this thread for mead, if you are a mead fan here is an offer you cannot refuse. Up for grabs are 10 bottles of mead of 25,50 and 70 CL which will be sent at no cost to those who plead the best story of why I should send them a bottle at absolutely no cost. All that I ask is ...
by Carnot
Wed Dec 04, 2019 12:00 am
Forum: Brewing Equipment
Topic: Gardena Garden Hose - disaster or a subtle new dimension?
Replies: 10
Views: 958

Re: Gardena Garden Hose - disaster or a subtle new dimension?

The hose will be plasticised PVC and the plasticiser will most likely be either DOP or DiNP, both of which are ortho phthalate plasticisers. If the hose is more than 15 years old it is likely to be DOP. In either case it will not kill you and unlikely to harm you. Plasticiser will migrate over time,...
by Carnot
Mon Jul 29, 2019 6:13 pm
Forum: Brewing Equipment
Topic: RO water filter
Replies: 25
Views: 2051

Re: RO water filter

The reject rate for an RO is a function of the mineral ,loading AND the water pressure. For water to permeate through the membrane requires the osmotic pressure to be overcome. As the mineral loading increase so does the osmotic pressure. If you have a low mains pressure then there will be a very hi...
by Carnot
Mon Mar 25, 2019 7:23 pm
Forum: Brewing Liquor
Topic: Brewing liquor question
Replies: 38
Views: 3858

Re: Brewing liquor question

I will chip in my two cents worth but do not want to get embroiled in a pointless discussion. Several observations. You have a very thin water, which will be lacking any buffering in its delivered state. Calcium carbonate is sparingly soluble in water- typically about 40-50 mg/L depending on the oth...
by Carnot
Mon Mar 18, 2019 6:21 pm
Forum: Brewing Equipment
Topic: Plugging a 1" BSP hole
Replies: 10
Views: 1146

Re: Plugging a 1" BSP hole

That looks a nice neat job. I think you made the right choice. Fit and forget.
by Carnot
Wed Mar 06, 2019 8:37 pm
Forum: Brewing Equipment
Topic: Plugging a 1" BSP hole
Replies: 10
Views: 1146

Re: Plugging a 1" BSP hole

Be careful here. Make sure that the flange has an o ring groove otherwise you are likely to find that the ring will squash out. A Groove will trap the o ring in position. The other option, one I have done many times, is to use a Dowty seal, preferably a stainless one. https://www.ebay.co.uk/itm/DOWT...
by Carnot
Fri Jan 11, 2019 9:33 am
Forum: Brewing Liquor
Topic: Can alkalinity be too low?
Replies: 4
Views: 1246

Re: Can alkalinity be too low?

Guy, I do not think 16ppm vs target of 20 ppm is going to make much difference. Test kits are never super accurate so your 16 might even be 14 or 18. When you are getting to the extreme end of the range it is always a little tricky. When you get to 20 ppm alkalinity there is not much alkalinity buff...
by Carnot
Thu Dec 13, 2018 8:10 pm
Forum: Cleaning, Sanitation and Sterilisation
Topic: Cleaning and Domestic Drainage
Replies: 4
Views: 1331

Re: Cleaning and Domestic Drainage

Starsan is phosphoric acid and DDBSA. It will not have much effect on the septic tank system. If anything the phosphorous will act as a nutrient and the DDBSA will biodegrade without any adverse. I would switch the VPW to PBW, since the latter contains sodium percarbonate which will very quickly deg...
by Carnot
Thu Dec 13, 2018 7:46 pm
Forum: Grain Brewing
Topic: What do you think this is, floating on boiled water?
Replies: 10
Views: 2026

Re: What do you think this is, floating on boiled water?

I am pretty sure that as per the other posters your scum on the surface is limescale a.k.a. calcium carbonate.Your water is hard but far from ultra hard. When you boil the water the bi-carbonate (soluble) will decompose and precipitate as calcium carbonate. I suspect that the vigorous boil is not al...
by Carnot
Wed Sep 26, 2018 8:40 am
Forum: Mead
Topic: Beeswax - influence on mead fermentation?
Replies: 5
Views: 1512

Re: Beeswax - influence on mead fermentation?

You were lucky with your cappings; they are much wetter than what my wife produces. She drains the cappings to avoid too much give-away. I have so far about 24 buckets of cappings to deal with from about 900 kg of honey produced this year. At 1.1080 I would reckon your mead will be fairly dry and yo...
by Carnot
Tue Sep 25, 2018 3:52 pm
Forum: Grain Brewing
Topic: Water analysis by Wallybrew/Pheonix analytical
Replies: 63
Views: 7443

Re: Water analysis by Wallybrew/Pheonix analytical

I would not be too hard on Murphy not being able to determine sodium content. Sodium and Potassium are not particularly easy to determine, and require the use of a flame ionisation spectrophotometer i.e. high cost. Nitrate and sulphate are also not that simple. I would consider a fee of £26 for the ...
by Carnot
Tue Sep 25, 2018 3:33 pm
Forum: Cider Making
Topic: Apples for making cider
Replies: 11
Views: 2037

Re: Apples for making cider

It's a bit of a drag but you will find apples for free in your local area if you look hard enough. Often the owner is glad to get rid of them. Ideally you need a mix of cookers and eaters. All eaters will result ins a cider without much bite. The cookers have more tartness due to malic acid and this...