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If your water is 000 it won't be from any tank residue. Half a handful of dust thrown into a tank isn't going to affect the PPM. We talk in PARTS PER MILLION on here. Think about it. Lets say your tank is 300 litres, thats three hundred thousand millilitres of water in there. My money is on dirt in the air, wind, how close are you to tress. Or the seal on the window. Don't worry too much, its only window cleaning.
matt i understand what your saying but the ppm refers to hardness or softness of the water . PPM is a measurement of TDS. Total dissolved solids. Hard or not if you're TDS meter says zero, its zero.for the record i now also believe it was wind but just scoping everything outalso the filter between tank and pump had little bit of dirt in there which i cleaned out , cud this have add to it? Nope, wouldn't influence it to that degree
Just don't worry about it..get out there and splish...splash...give me the cash and dash