Hi,
I bought a 5 litre bottle of water to mix my StarSan(ChemSan) in 10ml of starsan to 5 litres of water. That lasted 3 batches in the space of around a year or 2.
I checked the PH level today and it was at 4 so I emptied it out (apparently it needs to be under 3.5 to be effective)
I...