Filter bag & cutting fluid

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Filter bag (3-6 pcs depending machine) is very expensive as original part.
Has anyone found cheaper model ? (where to buy)

And about cutting fluids:
What fluid are y using in Okumas ?
(machining steel & cast iron)
We use Quakercool 3750

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Reply to my own message:

I found very good and long lasting filterbags for Okuma:
Textilfilter