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by homeburrero
March 25th, 2024, 3:01 pm
Forum: Water
Replies: 7
Views: 154

Low pH a problem?

Good news. A GH and KH in the 50-70 range is a reasonably good place to be, and if you are measuring a TDS on that water down in the 50 ppm range you have a pretty good indication that your chloride is not high. Be sure to have the water at around 25C (77F) when you measure
by homeburrero
March 25th, 2024, 2:38 pm
Forum: Water
Replies: 3
Views: 66

Australian Distilled/De-ionized water

In some parts of Australia I think ZeroWater filtration would be a good option. Not just cost wise but also to reduce the container waste. Maybe not for Perth though where the TDS of the tapwater can easily be up in the 300-600 range. ZeroWater filters are more quickly exhausted if you have high TDS -
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by homeburrero
March 23rd, 2024, 12:47 pm
Forum: Water
Replies: 7
Views: 154

Low pH a problem?

Good questions, and it's true that these terms in common parlance can be a little confusing, especially to a chemist. KH, carbonate hardness, and alkalinity are a good example. Coffee and aquarium people tend to use these terms interchangeably as synonyms for alkalinity. Going further with some geek...
by homeburrero
March 23rd, 2024, 12:40 am
Forum: Water
Replies: 7
Views: 154

Low pH a problem?

That water is unlikely to drop scale, and it may be fine but also may be corrosive. A pH of 6.7 isn't too bad, but pH measurements can be iffy. And a TDS of 49 may be OK depending on what minerals are in there. An alkalinity measure is a better measure than pH for evaluating corrosion risk
by homeburrero
March 22nd, 2024, 12:31 pm
Forum: Water
Replies: 12
Views: 558

Undersink RO water with remineralization

Yes, this monitor (like all inline RO TDS monitors that I'm aware of) is a simple linear NaCl calibrated conductivity meter with a calibration factor of 0.5. This factor is ideal for typical calcite or calcite+Corosex™ remin cartridges -- the ppm difference between before and after is a good approxi...
by homeburrero
March 18th, 2024, 5:31 pm
Forum: Water
Replies: 7
Views: 123

Express Water Tankless RO + Remineralization for Espresso?

Yes. That really simple recipe of just a little bicarbonate was proposed by the late Robert Pavlis, chemistry professor and HB member "rpavlis". He argued that a little bicarbonate, either sodium or potassium, was a good idea for both taste and corrosion protection reasons, and there was really no n...
by homeburrero
March 18th, 2024, 12:49 pm
Forum: Water
Replies: 7
Views: 123

Express Water Tankless RO + Remineralization for Espresso?

I don't know enough to recommend that tankless RO system and they aren't very clear about that remin cartridge but I suspect that it would be adequate for making non-corrosive, scale free water that you then add to your reservoir. You can do a crude test with a conductivity TDS meter to see that it'...
by homeburrero
March 18th, 2024, 11:52 am
Forum: Water
Replies: 11
Views: 197

WLL water and scale

Yes. 8 grams (8 ml) of your concentrate solution in a liter of distilled gives you the 1 mmol/L (50 mg/L as CaCO3) that Dr Pavlis recommended for his full strength recipe. The WLL recipe without any Epsom is slightly less, about 42 mg/L as CaCO3 which is not enough to make a difference in taste or
by homeburrero
March 17th, 2024, 3:23 pm
Forum: Water
Replies: 11
Views: 197

WLL water and scale

We have some equations like the Langelier Saturation Index that have been used and tweaked for decades that estimate calcium carbonate (limescale) deposition in boilers. Unfortunately we don't have anything like that for estimating the scale risk for magnesium carbonates and/or hydroxides. The chemi...
by homeburrero
March 17th, 2024, 2:46 pm
Forum: Water
Replies: 11
Views: 197

WLL water and scale

oops I screwed up my initial conductivity calculation. I need to be more careful! The expected conductivity of this recipe is 230 uS/cm, which would read about 115 ppm on an NaCl calibrated TDS meter. So your readings are not far off. If you were to use a TDS meter calibrated to a Myron-L™ 442 solut...