yeah, machines always been on ro refreshed with potassium bicarb. as such theres nothing in there to scale, but it can leave soft deposits from reading,
machine is less than a yr old yeah.
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This is the image of the water advise thread from Dave
see thats what i tend to do, as i use the steam boiler hw tap for americano so drag atleast a cupful if not more through a week,
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Waitforme Should it be Sodium or Potassium Bicarbonate I add to Ashbeck to raise the Alkalinity ?
If it’s added then is it likely that the brew boiler won’t scale at normal temps ?
I would use potassium bicarbonate to keep Sodium at 10mg/l but it’s up to you.
You can use the spreadsheet in my signature to calculate how much to add to 5 litres or whatever you want (the relevant instructions are to the right hand side of the cells on the example page…it’s not as complicated as it seems, just edit one cell at a time. That way you can lift alkalinity to whatever you want with whatever quantity of Ashbeck you have, scales willing. 0.2g Sodium Bicarb will get you to appro 50mg/l Alkalinity but Potassium Bicarb will be a bit different.
Grif was under the impression that would be corrosive….I can’t remember where I got that idea, presumably its not right?
It is corrosive, this is also a true statement for water that doesn’t form scale. However, the water is distilled directly into a sealed container and stored in a sealed container so has limited contact with gasses to dissolve (which is one of the main things to cause corrosion). Other than that the boilers are 316l steel which is fine for storing distilled water…..and additionally, it doesn’t stay pure for very long. I wouldn’t do it with Brass/Copper though.
Cuprajake i use my pavlis water, which is potassium bicarb,
should i still be flushing the steam boiler?
Yes but not as often. You’ll get sediment when solubility is exceeded (will take a very long time), other than that you’re just looking at increasing alkalinity which isn’t bad. I did read 316l steel is susceptible to some discolouration or very low level corrosion from potassium bicarbonate, not sure why but the same wasn’t true for sodium bicarb. This is room temp testing and it appears to be Potassium bicarb without water i.e. just powder sitting on the metal so 99.9% certain it’s nothing at all to worry about.
Thanks @Rob1
I downloaded the IPad XL App and used your spreadsheet.
I wasn’t sure how to use the Ashbeck data but I input the data from my water authority and got the results below, looks like my tap water is ok apparat from slight corrosion potential.
Is there anything I could add to tap water to lessen the corrosion risk ?
Waitforme I wasn’t sure how to use the Ashbeck data but I input the data from my water authority and got the results below, looks like my tap water is ok apparat from slight corrosion potential
Ashbeck just lists Calcium, Magnesium and bicarbonate to put in the tables at the top?
Anyway, you can add bicarbonates to raise alkalinity to the example above. Tap water can be quite inconsistent, the supplier only cares that things are within acceptable limits.
There are 5 pages to the spreadsheet (I think) the 4th one is the remineralisation page all blank, the 5th is just an example to refer to.
So in preparation for the delivery of my Minima I’m looking at my water. I’ve put 5l of tap water through the zero jug, which is giving me a TDS reading of 0 with the reader that came with the unit.
I have just cracked open the API drop test kit. Apologies in advance if this is a stupid question, but I presume I’m supposed to be looking at GH as opposed to KH?
Using the GH test kit, one drop turned the water in the tube green. If I understand correctly, with this testing kit, for boiler safe water I need to get to having to put 3 drops into the water in order to bring it to 53.7 or thereabouts (stage 3) on the conversion chart?
What would be the best way to harden the water? should I mix with some more tap water or should I be using something else?
Does the alkalinity take care of itself with the GH test, or do I need to do something else as well?
Apologies for the questions, just want to make sure I’ve got this right before putting in into a brand new Minima haha
dutchy101 I have just cracked open the API drop test kit. Apologies in advance if this is a stupid question, but I presume I’m supposed to be looking at GH as opposed to KH?
Using the GH test kit, one drop turned the water in the tube green. If I understand correctly, with this testing kit, for boiler safe water I need to get to having to put 3 drops into the water in order to bring it to 53.7 or thereabouts (stage 3) on the conversion chart?
What would be the best way to harden the water? should I mix with some more tap water or should I be using something else?
Does the alkalinity take care of itself with the GH test, or do I need to do something else as well?
Apologies for the questions, just want to make sure I’ve got this right before putting in into a brand new Minima haha
LMSC For alkalinity, you need at least 40 mg/l, which you can get by adding 50 mg/l of sodium bicarbonate.
It’s 67mg/l Sodium bicarb for 40mg/l alkalinity but unless you’ve got lab scales you’ll probably need to make a concentrate instead.
dutchy101 I have just cracked open the API drop test kit. Apologies in advance if this is a stupid question, but I presume I’m supposed to be looking at GH as opposed to KH?
Ideally, control the KH for alkalinity and the zero water jug should keep GH down. You can mix with tap water or add potassium/sodium bicarb….or both if you want. Test for both. If you can’t fit 20ml in the test tube just use an espresso cup.
Thanks guys. The test tubes provided are 5ml so will find a different vessel for the tests.
Out of interest, do those with RO units do this test every time you make up a batch of water or do you just trust the RO to be consistent and work to the formula you’ve worked out?
dutchy101 Out of interest, do those with RO units do this test every time you make up a batch of water or do you just trust the RO to be consistent and work to the formula you’ve worked out?
No. I test the water from RO unit when I flush out every 4-5 weeks. It’s too much of a faff otherwise.😊
That’s what I wanted to hear - thanks
I have a built in tds meter on my output
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Did anyone get to the bottom of is it better to add Potassium Bicarbonate or Sodium Bicarbonate to Ashbeck?
If so how much was needed to be added to a 5 litre bottle. I have attempted to use the linked spread sheet but I am just not getting it!
LMSC Test both the GH — hardness and KH — Alkalinity
Please take 20 ml water for each test
1 drop at a time, shake and proceed further. You stop when you get green for GH and yellow for KH
Multiply the number of drops using the table
Divide the result by 4 to get the 5 ml reading.
The result will be X mg/l
Plug that on Rob’s excel and post it here.
For alkalinity, you need at least 40 mg/l, which you can get by adding 50 mg/l of sodium bicarbonate.
OK, so I’ve just taken two 20ml samples. For hardness (GH) the water started to turn a very weak green after 1 drop and then a bit stronger after the 2nd and gets to a more solid green at about 4 drops. The same was true for the KH test to turn the water yellow but perhaps 5 drops to get to the more solid yellow.
Looking at the chart, the ppm level for 4 drops is 71.6, so if I’ve understood when you say “multiply the number of drops using the table” correctly, I should multiply that by 4 and then divide this again by 4 to give me the 5ml reading, which would be 71.6 for hardness?
Using the same method and 5 drops of the KH solution is 89.5 × 5 drops = 447 divided by 4 = 111.8 alkalinity
I’ve plugged these into the relevant section of the table.
I think the table is giving you the 4 drop measure at 71.6, which should be divided by 4 to get the 5ml result.
