Your tank has not permeated...
Even the cheapest thin-walled plastic tanks rarely do...and definitely not Catalina's OEM installed tanks. They're made by Ronco Plastics...the walls are 2-3x as thick as most OEM tanks.Otoh, if your tank was installed by a PO, and is metal, it's most likely leaking. Urine is so corrosive that 10 years is average lifespan of any metal tank. If it is plastic, these are the possibilities: 1. You haven't completely eliminated the odor from any spill when you replaced the hoses, 2. Your tank fittings aren't sealing completely...especially if you didn't wrap the threads with Teflon tape, 3. I have seen a couple of boats on which OdorSafe has failed..especially if bleach, any household chemical bowl cleaners, pine oil cleaners, or any other household chemical cleaning product has been used. But it's not impossible, even if they haven't. So test 'em for odor permeation...the good news is, SeaLand does warranty it for 5 years4. The tank vent line has permeated.