MonkeyJesusFresco said:

what's the benefit of SFDs?

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They are used to cover our GE (Gas Exchange) holes on our spawn jars.  Keep contams out of jars

MonkeyJesusFresco said:

I mean, as opposed to just polyfil?

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MonkeyJesusFresco said:

I mean, as opposed to just polyfil?

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TL's Quote from his lid tek

"Pros of SFDs:
1. You never have to replace the filter; the lid will wear out before it.  Therefore, when your lid is done, you just cut the RTV w/ a razor/knife under it & reapply it to a new prepped lid.
2. You DON'T have to put foil over your lids when PCing. This saves time, money & effort.
3. If you prep your SFDs like I do in this tek, you get 5-6 Filters per 1.  Therefore, per lid it's about 15-20 cents. Not that expensive at all. When I first started in mycology I purchased 48 100mm SFDs. I still have 12 sitting around, yet to be cut.
Cons of Polyfil or Tyvek:
1. You have to replace it almost every time.
2. You have to use Foil over your lids when PCing.
3. They're not good as filters."

Well I've essentially turned polyfil into SFD's.  Instead of stuffing the polyfil into the GE, I've ironed it down so that it can be a manageable cover of the GE hole

cronicr said:

MonkeyJesusFresco said:

I mean, as opposed to just polyfil?

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security and comfort

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blindingleaf said:

thats clever.  i wonder if u could mod the tek to create a perfect polyfill layer for the bottom holes of a mono, not to thin, not to thick, to secure to the outside instead of stuffing it. 

if u will it, it is no dream

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BCW said:

I'm not sure ironing would have a significant impact in increasing fiber density for microscopic filtration. I like your idea though, it's inspiring. Do you think the fabric now feels denser? Or does anyone know how to measure the fiber density of a fabric?

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NewfoundFreedom said:

They already sell polyfil in the form of a mat/sheet. It's not a good substitute for a real SFD.

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Well then tell me what is a good substitute?  I couldn't find any so I experimented with this.  As I stated at the bottom of my tek, I recommend using a real SFD.  TL stated that easy-felt WAS a good substitute.  This is essentially the same thing.  Science can not advance with out experimentation

Dialated said:

blindingleaf said:

thats clever.  i wonder if u could mod the tek to create a perfect polyfill layer for the bottom holes of a mono, not to thin, not to thick, to secure to the outside instead of stuffing it. 

if u will it, it is no dream

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Well you know how we stuff the bottom holes very tightly on our mono's, maybe if I ironed more layers.. it would essentially be the same thing?  I was thinking the same thing yesterday though.

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blindingleaf said:

Dialated said:

blindingleaf said:

thats clever.  i wonder if u could mod the tek to create a perfect polyfill layer for the bottom holes of a mono, not to thin, not to thick, to secure to the outside instead of stuffing it. 

if u will it, it is no dream

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Well you know how we stuff the bottom holes very tightly on our mono's, maybe if I ironed more layers.. it would essentially be the same thing?  I was thinking the same thing yesterday though.

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u would have to play around with it. i do think its possible to stuff bottom holes to tight.  I'm always looking for 1/4"-1/2" evap ring around my bottom holes these days.  others have no evap ring and do fine tho, so its all about dialing in the particular tub to its environment (fan, window, temp, etc).  so i wouldn't make it as strong as the one u used for a filter, because an SFD on the bottom of a mono sounds too restrictive, id make it less thick.

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