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Thank you all. Makes sense - it didn't occur to me until after posting, but of course diamond wheels won't be affected because they're (nearly) non-wearing.

About the water recovery - I'm not sure if I've got a different shape of water trough or not, but I never spill a drop when I pour it out. Actually I find it quite reliable, even into narrow jars.  No turkey baster needed

Hello All,

My first post on the forum after being a reader for so long. This is a great community and I appreciate all the shared knowledge.

One thing I haven't been able to find info on (here or elsewhere) is whether the water (with Anti-corrosion) needs to be changed when moving to different diamond wheel grades (from DC to DF to DE)?  Up to now I haven't been doing that since I normally only do small sharpening sessions it seems a waste to throw it away each time.  But the question came to me after reading that water should be changed when switching from SG to SJ which I was instinctively doing anyways.  If I know I'm sharpening the next day I'll decant the leftover water+AC into a jar and re-use it, but should I in fact have three jars (one for each grade of diamond wheel)? 

A separate but related point - should the diamond wheels ever be washed or rinsed?

Thank you all!