https://www.vetnurse.co.uk/f/clinical-discussions/31845/biopsy-disposal Hi there , we have a back log of retained biopsy lumps that were never sent to the lab. Plastic container , 10%neutral buffered formalin and content s all need disposing of however it s not very straight forward. Any tips en-USTelligent Community 10https://www.vetnurse.co.uk/thread/175514?ContentTypeID=1Wed, 27 Nov 2019 19:46:40 GMT1a0763ec-3885-442c-853e-6cef656dfec5:b90b4bb0-2b9e-499b-8464-3f20c0a2872dapache<p>Most of our farmers use it in foot baths and it ends up in the slurry. We have a septic tank at work so it goes down the sink. Mass into clinical waste/body parts bag in freezer.</p> <p>If you google various university sites say you can flush formalin down the sink with 100X the volume of water.</p><div style="clear:both;"></div>https://www.vetnurse.co.uk/thread/175513?ContentTypeID=1Wed, 27 Nov 2019 19:25:45 GMT1a0763ec-3885-442c-853e-6cef656dfec5:26e0583b-092b-4c76-87cc-e9fe738e9d11Sal the 1st<p>I usually decant the formalin into a large container and use wood base cat litter to &#39;soak&#39; it up so it is no longer a liquid which is disposed of in doop and lumps with drained histo pots in yellow bag for incineration. Make sure when draining histo pots you do it in a well ventilated area, ideally outside, and wear PPE which goes without saying</p><div style="clear:both;"></div>