[Nathanael Jones]

This is how "1000" times purer actually works.

My tap water TDS is around 300 ppm. For the sake of maths, lets say the water I clean with is 1ppm and I have a 1000 litre tank.

1000 litres of water = 1 million grams of water, so my cheapo Vyair RO and DI remove 299 grams of the dissolved solids

To get that reading down to 1 part per billion would require removing an additional 0.999 grams of dissolved solids, a whopping 0.3% extra impurities,... thats worth spending an extra few grand isn't it??

 : : :

[Lee Burbidge]

This is how "1000" times purer actually works.

My tap water TDS is around 300 ppm. For the sake of maths, lets say the water I clean with is 1ppm and I have a 1000 litre tank.

1000 litres of water = 1 million grams of water, so my cheapo Vyair RO and DI remove 299 grams of the dissolved solids

To get that reading down to 1 part per billion would require removing an additional 0.999 grams of dissolved solids, a whopping 0.3% extra impurities,... thats worth spending an extra few grand isn't it??

 : : :

Plus extra cleaning power. Once you have spent the grand your quids in.

[AuRavelling79]

Lee, you make me smile.  

I think this post Ian lancaster put in another thread chimes with me...

I tell the lads that anything under 10 is fine - and it is, never any complaints that could be attributed to "unpure" water.  Most of them have 300gpd's that produce in the low teens before DI and we have one 40-40 that consistently produces 6-7 and we don't bother with DI for that one.

000 is not a magic number, all you need is water that is pure enough not to allow any dissolved material to precipitate out on the glass as it dries.  The is no law that says this has to be below 1 ppm,  that's just a convenient benchmark - if the result is as required, the water is pure enough.  We've just heard of Ionics "0 parts per billion" - that's not going to make the window any cleaner, it's just a gimmick Ionics have dreamed up to entrap the gullible.