Gold filter liner hack

Forums Air Tanks, Pumps, Compressors, & Filters Gold filter liner hack

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    Humdinger
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    In my opinion an inner liner isn’t an absolute necessity if you use the gold filter with 13X micro sieve media and are servicing your filter every 10 hours as you should. The Diablo filter contains desiccant media without a cartridge and I doubt a leading vendor would sell them if they were a liability risk.  The  gold filter has to do a lot more moisture removal when used with a $300-$400 economy Chinese compressor.  These compressors do not have a well designed moisture separator and put a lot more moisture into any high pressure filter.  A more expensive well designed compressor has a water separator tower after the first stage which removes 99.7% of all moisture before it reaches the high pressure filter.   If you are getting visible amounts of water purged from your high pressure filter or quickly saturating media then your economy compressor is the reason. Modifications you choose for your filter are done at your own risk. 

    The original gold filter hack uses 1.25″OD PVC and o-rings as a media cartridge substitute to prevent  moisture from the filter walls.   One filter vendor claims that water vapor mixed with desiccant media leeches acid causing the filter walls to oxidize and become unsafe.  Another vendor sells the unlined Diablo filter yet no one has ever posted that it has oxidized from damp media leeching acid. The problem with  using 1.25″ O.D. PVC and O-ring seals is the gold filter is 1.375″ inches in diameter leaving an opening space.  It is likely that 1.25″ PVC and O-rings do not provide an airtight seal inside. Moisure and high pressure air could channel around the .0125″ size differential. I have been trying find a solution to help gold filter buyers to ease their oxidation concerns and save them money by using the affordable gold filter.  It would be an easy fix if there was 1.370″ polycarbonate straight tubing available.  There is 1.375″ OD polycarbonate tube, alumium tube, and stainless steel tube available but none fit in this filter.  They won’t fit unless you can reduce their diameter with a lathe .005″ for them to fit.

    Here’s an easy fix.  It only costs $1 for a package of 8 flexible plastic index dividers from Dollar Tree as pictured below.  Each  liner should last the filter’s lifetime.  The flexible plastic index dividers are from their school supply section or obtainable from an office supply store.  The only accessories needed are a 1″ or less round dowel rod and a straight edge paper cutter.  If you don’t have a paper cutter, a T-Square or L-Square and a razor knife will suffice to square up the liner material.   The liner is shaped by cutting the flexible plastic index dividers into a 10″ length and 8″ width and cutting off the divider tab.  It needs to be rectangular 10″ x 8″ or less width so that when rolled on the dowel rod it is squared at each end.  Place the rolled plasic liner into the filter housing, remove the dowel rod and it will expand itself and fit snugly to the inside wall.  There is enough overlap that you get nearly two full layers of plastic lining inside the gold filter.  Pull out the plastic tube to just beyond the filter housing threads and add 3/4″ cut lengths of the tampon that come with the gold filter as round end caps. One end is inserted to the bottom with the dowel rod and spaces the tube.  Use the dowel rod to push it toward the bottom of the gold filter but not completely out of the partially pulled up tube liner.  Pour in your 13X desiccant media, then insert the top end tampon section, then push the filled tubing down into the filter to the level of the threads.  This way inserting the tampon caps is simple and won’t fray them from being squeezed over the plastic tube lining with the dowel.  Air pressure expands the liner so tightly  to the filter that it holds any moisture inside and is fully absorbed by the media.  The tampon ends prevent any damp media from touching the threaded filter end caps.   You now have a home made cartridge for your gold filter that fits it perfectly with no leaks, acid leeching, or air channeling concerns.


     

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    Centercut
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    Nice!  A couple of photos would be appreciated. Thanks!
    ​So the liner stops just prior to the threaded section on each end?

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    Humdinger
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    Yes.  The interior unthreaded length inside the filter is 10 inches.  If you fill desiccant to the level that leaves one tampon halfway beyond the threads then screw the endcap down it compresses the media between the two tampons.  The liner expands to fit the wall diameter under its own tension.  As soon as it is pressurized it is tight to the outer wall so no air can channel past since it is an exact fit.

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    Centercut
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    Very smart idea. Even though I don’t buy in to the “acid” leaching from the Zeolite 13X, and the fact that I haven’t experienced any damage or staining on the inside of my gold filter tube or threads, it can’t hurt to be safe. 

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    Loren
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    jphonky
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    How about a standard 8.5 x 11 laminate sheet? Granted it’s bigger than 8.5 x 11 since that’s the paper size. Could easily be cut down and readily available for free depending on where a person works.  

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    Humdinger
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    “jphonky”How about a standard 8.5 x 11 laminate sheet? Granted it’s bigger than 8.5 x 11 since that’s the paper size. Could easily be cut down and readily available for free depending on where a person works.  

    
That would work.  It just needs to be flexible enough to roll into a tube but strong enough to sping into position.  The critical dimension is the length to fit inside the threads of the Xin Yong Shi gold filter.  That inside length is 10 inches.  The width wouldn’t need to changed.  8.5″ width is good.   There is  Tuxing gold filter that I’ve only recently found out about.

    It appears that the inside length is more than 10 inches if you get the Tuxing gold filter as the end caps have fewer threads.   My choice is the Xin Yong Shi because of the strength from more end cap threads and the holes in the caps to give leverage for a tool to loosen them.  The Tuxing gold filter has a notch in the end cap which would require a  large crescent wrench to loosen them.

    These filters usually arrive with the caps screwed on very tight.  It is wise to lubricate the threads with a light grease after you open the filter.  It isn’t necessary to overtighten the end caps after servicing as the O-ring inside provides the air seal.  Hand tighting the caps makes it easier to open in the future.  I had to wrap my filter body in a towel and grip it in a vise so it wouldn’t slip while I loosened the tightly closed end caps.  I used a Phillips head screwdriver inserted into the endcap hole for leverage to open it.  

    It’s helpful to protect the gold anodized finish on the outside of your filter by wrapping  it in a layer of the same type plastic laminate used for the inner liner.  Lots of owners mount their filter vertically with metal hose clamps.  Roll the filter over the plastic laminated sheet and then use clear tape to secure the laminate in a roll shape.  It protects the anodized gold finish from getting marred by the hose clamps and can be slid off partially to remove the caps for servicing.

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    jphonky
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    Thank you for the quick thorough response! I change mine regularly so I will keep a close eye on it and put a liner in it if I feel necessary. I’m just glad that I got the filter…. These china compressors definitely let a lot of moisture through. I filled a 30min scba tank from empty and the little filter included with the compressor was soaked. I have the tuxing filter. I have a flex 30 on order. Hopefully will be seeing it soon. Gonna be a big step up from my 22 marauder… I am very anxious! 

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    Humdinger
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    “jphonky”Thank you for the quick thorough response! I change mine regularly so I will keep a close eye on it and put a liner in it if I feel necessary. I’m just glad that I got the filter…. These china compressors definitely let a lot of moisture through. I filled a 30min scba tank from empty and the little filter included with the compressor was soaked. I have the tuxing filter. I have a flex 30 on order. Hopefully will be seeing it soon. Gonna be a big step up from my 22 marauder… I am very anxious! 

    
The smaller $300-400 China compressors are passing much of the moisture along to the high pressure filter because they omit a quality water separator tower to catch most of the moisture before it reaches the filter.   The $1,000 plus compressors from China do have much better water separators so the filter isn’t getting saturated nearly as fast. Monitor your filter more frequently if you use it with a compressor that omits the water separator tower.  The Yong Heng/Tuxing types have a drain but no separator tower.  There is a double gold tower system available for around $300 that uses the first tower as a separator and the second tower as a filter.  

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    jphonky
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    Again, thank you for your time, knowledge and great response….It is hard to express how much simple communication can make a difference.

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    kingrude1
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    I have been wondering why the need for the hack? Is the original design not sufficient? I bought the gold filter and some of the replacement filters, I think I will use as is, and see how much life I get from the filters. 

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    Humdinger
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    “kingrude1”I have been wondering why the need for the hack? Is the original design not sufficient? I bought the gold filter and some of the replacement filters, I think I will use as is, and see how much life I get from the filters. 

    
Kingrude, in your situation you are correct.  There is no need for a liner if you only use the tampon filter material.  The hack is a cure to ease the concerns of gold filter owners who choose to fill their filters with Zeolite 13X micro sieve media for better moisture absorption.  If your compressor has a good water separator tower and moisture dump then very little moisture ever reaches your gold filter. If you have an economy Yong Heng/Tuxing type compressor you need to replace and recharge your factory tampon inserts frequently.  Any dealer who sells a pricey alternative filter has to have a sales pitch.  The hack is to debunk the concerns of those who believe that molecular sieve might damage unlined gold filters. 

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    kingrude1
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    “Humdinger”

    “kingrude1”I have been wondering why the need for the hack? Is the original design not sufficient? I bought the gold filter and some of the replacement filters, I think I will use as is, and see how much life I get from the filters. 

    
Kingrude, in your situation you are correct.  There is no need for a liner if you only use the tampon filter material.  The hack is a cure to ease the concerns of gold filter owners who choose to fill their filters with Zeolite 13X micro sieve media for better moisture absorption.  If your compressor has a good water separator tower and moisture dump then very little moisture ever reaches your gold filter. If you have an economy Yong Heng/Tuxing type compressor you need to replace and recharge your factory tampon inserts frequently.  Any dealer who sells a pricey alternative filter has to have a sales pitch.  The hack is to debunk the concerns of those who believe that molecular sieve might damage unlined gold filters. 

    
Thanks for the explanation Humdinger. Would the zeolite hack be less expensive in the long run than replacing the tampon filters? I understand there is a need to contain moisture from getting into the tanks and ultimately your guns, just seems there has been some exaggeration and fear mongering on this topic with the intent of selling products to the public. 

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    Humdinger
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    “kingrude1”

    “Humdinger”

    “kingrude1”I have been wondering why the need for the hack? Is the original design not sufficient? I bought the gold filter and some of the replacement filters, I think I will use as is, and see how much life I get from the filters. 

    
Kingrude, in your situation you are correct.  There is no need for a liner if you only use the tampon filter material.  The hack is a cure to ease the concerns of gold filter owners who choose to fill their filters with Zeolite 13X micro sieve media for better moisture absorption.  If your compressor has a good water separator tower and moisture dump then very little moisture ever reaches your gold filter. If you have an economy Yong Heng/Tuxing type compressor you need to replace and recharge your factory tampon inserts frequently.  Any dealer who sells a pricey alternative filter has to have a sales pitch.  The hack is to debunk the concerns of those who believe that molecular sieve might damage unlined gold filters. 

    
Thanks for the explanation Humdinger. Would the zeolite hack be less expensive in the long run than replacing the tampon filters? I understand there is a need to contain moisture from getting into the tanks and ultimately your guns, just seems there has been some exaggeration and fear mongering on this topic with the intent of selling products to the public. 

    
Exactly.  The source of the fear mongering is not exactly an unbiased source of information.  Some of the claims are unsubstantiated, others are illogical, and some are laughable.  

    The answer to your question of micro sieve media vs. tampons is that it depends on your degree of usage.  For me, it’s micro sieve because it not only works more efficiently than the tampon but it is also reuseable by oven drying.  I added a few color changing desiccant beads to indicate when the media needs recharging in an oven.  If you are a frequent tank filler or are using the gold filter with a small compressor which doesn’t dump much of the moisture it generates then micro sieve is the less costly alternative.   I cut my tampons into 3/4″ end caps.  I bought a $15, 3 pound bag of micro sieve media that will last a lifetime, even assuming I replace it after recharging it a couple of times.  These filters only need to be serviced every 10-20 hours depending on how efficient your compressor water separator is at dumping moisture prior to reaching the filter.   Air Venturi and Carettes do a good job, the small ones don’t.   Pyramyd sells the tampons for $8 apiece plus shipping.  I’d rather line my filter for a dollar with plastic laminate and buy one bag of micro sieve that will outlast me and the compressor.

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