try the ehiem filter pad mod, its been working great on my 510, 401 and my new vapre51 w 801. they are the hot magnum sleeves size U found at pet stores. i cut the width of the cart and about 1/4 inch longer and stuff it it. works great at empting and lasts alot longer than anything i have tried. the PTB worked great but this is no mess no fuss!
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