First of all, what makes you think the water is soft? At my office, we have
bottled spring water, and it has a TDS of about 200 ppm all by itself.
Tastes great, but builds up on media pretty well.

Another potential reason for leaf-tip blackening is related to nutritional
deficiencies. What's your feeding regimen?

--

Ray Barkalow - First Rays Orchids - www.firstrays.com
Plants, Supplies, Books, Artwork, and Lots of Free Info!

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"Frank" wrote in message
om...
Dear All,

Some of the leaves on cymbidium start to show black tip. I checked
this newsgroup and people are saying that it is due to salt buildup in
the growing media. But the thing is that this cymbidium is in my
office and I use the water from drinking machine to water it. The
drink machine is a big box about my chest high, with 3 faucets, for
cold water, room temp water and hot water. I usually drink warm water
by mixing rt. water and hot water. I use the left over to water the
cymbidium. I assume the water from the drinking machine is soft water.
Is there any other reason to cause black leaf tip?

Thanks,
Tiff