Water hardness

As mentioned in the course
If the water is hard rather opt for distilled water.
What should the maximum hardness (calcium parts per million) be before opting for distilled water? (or) could you use water that has come out of a softener?

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Chris_Young_80640

100 to 250 ppm calcium is usually fine. Volvic brand or Disani are always reliable and readily available.

stretch.com

Thank you for that. @Chris Young

I found a tool on the Thames water (UK) to find out the hardness level in my area home measured at 257.0

Work 263.5

So I think bottled water it is then

But I think I will still check the hardness before purchase.

Now I see the values are sometimes written as mg/l -is that ppm?

Other formats seen...

mgl CaCO3 (ppm)

Degrees Clarke

Degrees German(DH)

Degrees French

Detergent rating

Chris_Young_80640

For pure water milligrams per liter is the is the same as ppm.

It's true because pure water at standard temperature and pressure has a density of 1kg/L so mg/L = mg/kg = ppm. But if there are other things in the water, then you have to adjust for density to convert mg/L to ppm.

I'm unfamiliar with the other units used by various countries.

stretch.com

Thanks @Chris

I can see why it is easy to ___ it up!

Waiting for my orders of bits and bobs before taking a crack at it

Mmm... What will the first one be?

Now slightly off topic it hour having to start a new thread...

Reaction, acidity, hardness, buoyancy, viscosity (I think I mentioned most of them) have been covered

Is specific gravity any concern or is that just nit picking?