With zapcaps you use the vacuum pressure to get them to hold. They are my favorite filters ever. Sometimes they will hold better when you put some oil in first then add vacuum pressure but they will hold at 25 no problem and you can re use them if wet you have to filter at or under 50°C. Every once in a while ill get one that's funny. So I will put the plastic piece in tight the tube connects to and put a thin strip of duct tape around the plastic piece to make a good deal there.
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Shit dude, I couldn't seem to get any vacuum pressure. I set the 500ml zapcap on to of a 45mm glass hybex and I got no vacuum whatsoever. I made sure to pressure the nozzle in as tightly as is could. I don't see how air could escape from there at that point. I even used a latex glove and some duct tape to try and seal around the neck, but it made no difference. I added the oil too. I was frustrated as hell, because I just had an AutoFill filter the night before that did this also.
I threw the zapcap in the trash and switched over to my Nalgene and had no problem at all. Just curious how many times did you have to squeeze the hand pump to get vacuum pressure in the zapcap? Could it be that maybe I didn't pump it enough? I don't have a gauge on my hand pump so I don't really know, but I pumped that bitch about 15 times and got no vacuum.
The Nalgene I only needed to pump about 6 or 7 times to get it to start flowing.
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Oh yah, anyone ever had a syringe filter explode in their fucking face. THIS GUY did. Out of the 130ml's my nalegen made it to about the 80ml mark before it decided to stop filtering no matter how much vacuum pressure I gave it. I think I maxed that bitch out. So I switched over to a .45 Nalgene syringe filer. At first I was using a 20ml syringe but it went so slow it was nearly impossible to use so I put the filter on a 3cc syringe. It was filtering very nicely. I was literally only giving it like 50 percent pressure, really wasn't pressing that hard and all when all of a sudden the filter spit right and have and a giant cum shot of oil came straight up into my eye. IN MY DAMN EYE. the fuck. that shit burned like hell.
You know which part of homebrewing I'm the best at? Throwing shit away. lol okay I think I've got a better handle on it now using the Nalgene I just think i'll stick to that. Every other filter I've tried hasn't worked half a damn. then again hell, I cant' even get the Nalgene to filter all the way. I'm switching over to MCT oil and using a little thinner mixture this time.