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Old 08-06-2017, 10:04 AM   #21
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There's a nice neat looking little RO system on eBay for £46, looks very similar to the one I use. I installed it under my kitchen sink and I love it.
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Old 08-06-2017, 02:19 PM   #22
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There's a nice neat looking little RO system on eBay for �£46, looks very similar to the one I use. I installed it under my kitchen sink and I love it.
Steve, How long would it take to process 30 litres, how many litres can it process between filter changes and how much water would it use to process 30 litres.
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Old 08-06-2017, 02:41 PM   #23
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Steve, How long would it take to process 30 litres, how many litres can it process between filter changes and how much water would it use to process 30 litres.
I'm not an expert on these by any means, but if you get a TDS meter it'll tell you when the filters are no longer functioning properly. With moderate TDS tap water, a set of filters should last quite a while, especially if you're only using it now and again for brewing. Mine collects about 10L/hour of processed water, though my water pressure is quite high. I've never actually measured the wastewater, but afaik a ratio of 5:1 waste to RO is fairly typical so they are quite wasteful. However the waste is perfectly safe if you collect it in a holding tank of some sort and have another use for it.
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Old 09-06-2017, 11:20 PM   #24
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Well that's exactly why I'm not a fan of CRS, a reduction of 100ppm alkalinity using CRS adds about 70ppm chloride and 100ppm sulphate which is a lot and should be taken into consideration. I prefer lactic acid or acid malt. But I think if your tap water has a high alkalinity, say 200+, you are much better going down the route of dilution rather than using acids.
I'm going to try diluting with ashbeck for Sundays brew, but am having a bit of brain fart with the calculations.
How do I calulate alkalinity of the ashbeck from the bicarbonate please? Or is bicarbonate in mg/l same as alkalinty in ppm?
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Old 10-06-2017, 07:22 AM   #25
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I'm going to try diluting with ashbeck for Sundays brew, but am having a bit of brain fart with the calculations.
How do I calulate alkalinity of the ashbeck from the bicarbonate please? Or is bicarbonate in mg/l same as alkalinty in ppm?
No not the same. Alkalinity=bicarbonate x 0.83
So for Ashbeck it's about 21 then. And I'm sure you know ppm and mg/l are the same
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Old 10-06-2017, 07:53 AM   #26
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No not the same. Alkalinity=bicarbonate x 0.83
So for Ashbeck it's about 21 then. And I'm sure you know ppm and mg/l are the same
Thanks Steve I'll have a play with some dilution rates today
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Old 10-06-2017, 08:50 AM   #27
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Cheers Steve, I was thinking similar, last time I did an IPA I just added CRS to my 190 Alk tap water then Gypsum and Epsom Salts according to the Forum Old Water Calculator.
It definitely tasted of minerals. So when I did my saison I halved the amount of Gypsum and added no Epsom Salts and it came out really good.
Last night I worked out my numbers using lactic acid for my 20 litre mash and CRS to my 12 litre sparge, with Gypsum additions to both according to your chart.
Hopefully it will work out.
I have decided to go for 6.8 ml of lactic acid in my 20 litre mash water and 12 litres of Ashbeck for my sparge water.
Adding 3.1 g of gypsum divided between mash and sparge water.
This gives
Sulphate 104 mgL
Chloride 42 mgL
Calcium 74 mgL
Ratio of 2.5 Bitter

I may even go with a little more gypsum, not decided yet.
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Old 10-06-2017, 10:16 AM   #28
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I have decided to go for 6.8 ml of lactic acid in my 20 litre mash water and 12 litres of Ashbeck for my sparge water.
Adding 3.1 g of gypsum divided between mash and sparge water.
This gives
Sulphate 104 mgL
Chloride 42 mgL
Calcium 74 mgL
Ratio of 2.5 Bitter

I may even go with a little more gypsum, not decided yet.
That looks pretty perfect to me, personally I wouldn't bother with any more gypsum
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Old 11-06-2017, 07:00 AM   #29
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So if my spreadsheet formula skills are up to scratch I've worked out:

37L water (22L tap + 15L Ashbeck)
+ 21ml AMS
+ 5g Gypsum

Should leave me with:

15 alkalinity
93 calcium
156 sulphate
66 chloride
(ratio 2.36)

The ratio looks better than I was getting using all tap water, using much less acid & less total minerals.

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Old 13-06-2017, 06:13 AM   #30
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All went well with my diluting brew day, but using only the narrow range test stips I have the mash ph still seemed a point or 2 high.
I think you mentioned you use acid malt @strange-steve - do you find it brings down ph by 0.1 for every 1% added as it mentions on the malt miller's description??
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