I9900 and Reffillables

Anybody have experience with alternate methods of inking the
Canon i9900? I'd like some feedback and consensus. Ive
used Weink.com's econo-flo refill system and it did great for
many months but lately I've been having problems that I don't
know are due to the ink or just laws of chance. Banding,
print head clogs, the usual. Put some OEM in there after
soaking the head, but I get the same thing.

thanks
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Art