Forum › Injection Technique

First Time Filtering - Final Check

7 replies7 peopleNov 4, 2026☆ Follow
Summary

What supplies are needed to transfer from vials to pens using smaller needles and what filter size works best?

The original poster listed a V3 pen, 4mm tips, 33mm PES filters and other items for moving reconstituted material into cartridges. Several replies flagged the 33mm filters as oversized and recommended switching to 13mm versions instead. Additional suggestions covered alcohol wipes for caps and flushing the filter with BAC water to recover hold-up volume. The OP acknowledged the size error and planned to correct the order.

What this discussion establishesWhere people disagree

Filter diameter: 33mm versus 13mm

Nothing here is advice.

7 replies · 7 people
NorthMeadow25archiveopening post4d

Since pinning twice a day with an 8mm needle, I figured there had to be an easier option and searched the forums for ways to move material from vials into pens so a 4mm needle could be used for subcutaneous injections. Using the threads and videos posted here I believe I have ordered everything required. Here is the list in case anything was missed. Went with a V3 pen after looking at another model whose cartridges were harder to source. Got 200 sterile 32G 4mm pen tips. Ordered sterile PES syringe filters 33mm 0.22um. Also 25G 38mm needles.

LikeSame experienceReply
SlowFenwick85archive4d

Those pads before a shot tend to slip my mind on a large purchase. They help clean the vial tops well.

LikeSame experienceReply
GreyLedger42archive4d

The ones you're working with seem oversized from my perspective. I switched to a smaller version for my own setup.

LikeSame experienceReply
IronFenwick84archive4d

I use 13mm filters.

LikeSame experienceReply
SlowBramble78archive4d
↳ replying to @IronFenwick84

I feel the larger size comes across as excessive. The smaller diameter ends up being my usual pick.

LikeSame experienceReply
SteadySparrow75archive4d
↳ replying to @IronFenwick84

I went over the main post's list and found it held up fine, though the big round filters stood out to me as well. I figured group members would notice and mention it. My understanding of those pens stays very limited, coming only from what one person I care about shared. Others should jump in with their own views too. I feel impressed by how much work the poster put into making such a clear and thorough write-up.

LikeSame experienceReply
NorthMeadow25archive4d

Darn, I actually intended to order the 13mm size, but had trouble locating sterile options, so I must have gotten carried away seeing that sterile label and the image seemed accurate, haha. Appreciate you catching that, I'll fix the order right away.

LikeSame experienceReply
PlainAlder11archive4d
↳ replying to @NorthMeadow25 (opening post)

These filters seem pretty big to me. I always check how much liquid they can retain and then push that same volume of bacteriostatic water back into the container. Mine include the smaller four millimeter ones along with thirteen millimeter versions plus some really oversized ones that probably retain around fifty units. I plan to check the capacity the next time I try them out. The thirteen millimeter size works best for me since they keep thirteen units and I add ten units of the water to clear them.

LikeSame experienceReply

Related discussions

Add your experience

If you have tried it, this topic is still open. Sign in to reply — it takes a minute.

Sign inCreate an account