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Check your fountain model
Where to find it
Turn the fountain over or lift the bowl: the model is printed on the base or on the pump housing. PETLIBRO models start with PLWF.
Measure the cartridge
Width and length of the old filter, in inches. SORON lists sizes on every filter page; a match within a millimetre is a fit.
Still unsure
Send a photo of the fountain and the old filter to fresh@soron-dbm.pages.dev; we reply with the matching pack.