hugedelts505
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What has everyone had the best luck in using as far as whatman syringe filters? I know several people prefer .2 micron and several prefer .45 micron filters, which I understand for bacteria/viruses. Nobody ever mentions which subtype they use with the greatest success though.
Such as: (all whatman types)
ANOTOP
GD/X
GD/XP
PURADISC
REZIST
SPARTAN
**And also the type of filtration media that's most desired with an oil type solution. Is nylon the best media as far as quickness?
The ones I'd ordered & received yesterday evening, had been delayed in shipping and therefore the company sent me some extra vials/chemicals and also said they upgraded my syringe filters to a higher cost type. I'm thinking I originally ordered "Whatman .2m GD/X 25mm filters." The company I ordered from had no option as to the type of filtration media the filter contained. The package they came in was a vacuum sealed, clear package with no name on the package, containing three filters that were each labeled ".2um Whatman PVDF." I know the pvdf is just the type of filter material,
but my huge problem was this:
**It took huge amounts of pressure to even get a couple drips out. Like all the force I could possibly exert. There was that much backpressure.
**It took 3 hours and 2 filters to process 20mL of my prop.
**So I prefiltered the oil with a coffee filter before mixing with my powder and bb and ba. Then mixed my prefiltered oil with my powder/solvents and prefiltered this solution twice through coffee filter material twice! Then proceeded to try and run through my filter, but the results were hardly any better. The backpressure was still just as much, it took my entire bodyweight force to obtain just a few drips and it took, like I said, hours to filter this small amount.
--**--What is my problem??? --**--
I know the filter was on the luer lock end of the syringe correctly, letters up facing me, with a 16 guage pin on other end and I also tried an 18 with no better success. I also tried backloading the syringe with my oil first, didn't help, then switched to drawing my oil and putting on my filter after this.
**NOTE** MY OIL WAS KEPT AT LEAST 100C THROUGHOUT AND EVEN TRIED 130,140C TO SEE IF THAT HELPED, DIDN'T!
Such as: (all whatman types)
ANOTOP
GD/X
GD/XP
PURADISC
REZIST
SPARTAN
**And also the type of filtration media that's most desired with an oil type solution. Is nylon the best media as far as quickness?
The ones I'd ordered & received yesterday evening, had been delayed in shipping and therefore the company sent me some extra vials/chemicals and also said they upgraded my syringe filters to a higher cost type. I'm thinking I originally ordered "Whatman .2m GD/X 25mm filters." The company I ordered from had no option as to the type of filtration media the filter contained. The package they came in was a vacuum sealed, clear package with no name on the package, containing three filters that were each labeled ".2um Whatman PVDF." I know the pvdf is just the type of filter material,
but my huge problem was this:
**It took huge amounts of pressure to even get a couple drips out. Like all the force I could possibly exert. There was that much backpressure.
**It took 3 hours and 2 filters to process 20mL of my prop.
**So I prefiltered the oil with a coffee filter before mixing with my powder and bb and ba. Then mixed my prefiltered oil with my powder/solvents and prefiltered this solution twice through coffee filter material twice! Then proceeded to try and run through my filter, but the results were hardly any better. The backpressure was still just as much, it took my entire bodyweight force to obtain just a few drips and it took, like I said, hours to filter this small amount.
--**--What is my problem??? --**--
I know the filter was on the luer lock end of the syringe correctly, letters up facing me, with a 16 guage pin on other end and I also tried an 18 with no better success. I also tried backloading the syringe with my oil first, didn't help, then switched to drawing my oil and putting on my filter after this.
**NOTE** MY OIL WAS KEPT AT LEAST 100C THROUGHOUT AND EVEN TRIED 130,140C TO SEE IF THAT HELPED, DIDN'T!