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wrote:

You mention shrinkage of natural material backed carpets: would
gripperrods or tacks not prevent them shrinking?

I've seen a flooded carpet pull gripperods right out of the floor. This was
a 35' long carpet that shrank by 10". Carpet fitter put it back with a
power stretcher once it was dry.

The unfinished cleaning FAQ I've put together lists
some stain removers not referenced by your article, but I wouldnt know
what could and could not be used safely on various types of carpets. I
dont know if theres some way we can cross-use the info.

The only safe way is to try them on a spare piece of carpet, or a bit hidden
under furniture. Some solvents can de stabilise the backing material.

There was one last point, yes. The stain site you linked to contains
many bits of info, but there must be something better somewhere. One
trick it missed is how to fix bleach spotted carpets. It said cut a
bit out and replace, but it was much simpler IME to recolour the
patch, if and only if its small. With patterned carpets this is
easily done by eye if the right colour is available, and made good
enough not to be noticed.

The cut & replace method is used commercially, but I've never seen
recolouring. Is it done with felt pens r brushes or what?

Oh, I also dont recall discussion of 1 versus 2 versus 3 tank machines.

Not sure what you mean? I tank with a diaphram, 2 separate tanks - 3 tanks?

And is my intuition right in thinknig bladder type tanks will not last
well?

They are used in scrubber dryer machines, but they are not common in carpet
cleaning machines. A good idea, if the diagphram material holds up. They
almost double tank capacity. Is this idea used in domestic machines?

And a final question, which isnt cleaning, but is somewhat connected
with it. Carpets with worn edges, beginning to fray and coming apart,
what is the best way, if any, to prevent further deterioration? I was
thinking perhaps some type of glue might do it. Do you know?

Copydex works a treat.

Dave