I assume it is the calcium levels. Calcium phosphate (or calcium hydrogen/dihyrdorgenphosphate at the pH levels we are concerned with) is not particularly soluble in water. I think the precipitate is this. I get it with my tap water, which is reasonably hard (high Ca2+ levels). In my opinion (fell free to disregard it!), so long as the pH is < 3 then this should pose no problems with the use of the Starsan solution.oldjiver said:
I found some data on t'internet (http://www.buckscc.gov.uk/media/137448/ ... survey.pdf) on pH and mineral levels of various bottled waters (from 2005). The Tesco Ashbeck water is listed as pH 6 with only 10 mg/L Ca2+ cf. Tesco value still which is shown as pH 7.3 and 91 mg/L Ca2+.
Calcium levels widely depending on the source of the water.
Sainsburys Pennine pH 7.7, 57; Asda Fountain Head pH 7.9, 26; Buxton pH 7.5, 60; Vittel pH 7.2, 77; Morrisons pH 7.6, 27; M&S pH 7.1, 108.
Re the hardness scale: 80-120 mg/L Ca2+ is considered hard, 60-80 moderately hard, 40-60 slightly hard, 20-40 moderately soft and 0-20 mg/L soft.
I'm in a hard water area, ~100 mg/L hence my cloudy Starsan.
