[Humphry Davy]

I’ve been looking for an alternative to filter stacks as my first filter (25 micron paper filter) keeps getting clogged towards the end of the dump.

Also I notice the solution can make its way around the sides of the ring that holds the paper in place.

I contacted SLE about making me an assembly for a filter bag (found a contact number GW posted on another thread) but communication broke off on her end and I’m yet to hear back in over a month.

If I can’t find an assembly built specifically for the filter bags, I’ve considered looking for an inline strainer that will fit the bags and just use a SS hose clamp to hold the top of the bag and secure it. Here’s an example of one:

https://www.glaciertanks.com/tri-cla...YaAmgPEALw_wcB

The following alternatives would help prefilter but would not eliminate the issues with solution bypassing underneath the filter paper

1) sandwiching some Pyrex glass wool between two filter stacks and using that as a prefilter but I’m concerned w the exposure to the material, if that’s even concern as I’ve heard some say it is and other say it is not.

2) placing SS ball bearings or a steel wool prior to the filter paper to act as a prefilter.


Any help would be greatly appreciated, I’ve had it with these filter stacks clogging up and slowing my whole process down.

[Humphry Davy]

I was able to get in touch w SLE again but yet again communication broke off on their end. So I’m testing alternatives including using the wort strainer that glacier tank offers.


However during my search for alternatives I came across glass microfiber filters made by Watman. Seems like it could be an upgrade from paper filters, their description begins on page 13 of this file:

https://www.bangkokscience.com/download/bangkokscience_com/Whatman%20Filter%20paper1.pdf

Has anyone used these with any success?

[SkyHighLer]

Have you checked out Duda Diesel's site?

https://www.dudadiesel.com/search.ph...bag+housing%22


Just a reminder (it's been this way for years,) SEOH's (Scientific Equipment of Houston) Amazon generic filter paper ads are a jumbled mess. For instance, if it says Fast in the title, the full description will be for a different grade. Order by "Fast" (Grade 4, quantitative, 20-25 micron,) "Medium" (Grade 1, 11 micron,) or "Slow" (Grade 5, qualitative, 2.5 micron) in the title, comes out right every time.

Here's a couple of examples:

https://www.amazon.com/Filter-Paper-...EPBY4MB41MD41P

https://www.amazon.com/SEOH-Filter-P...b+filter+paper

(btw the PDF link in the above post took me to a serious warning message)

[WaterFarmFan]

Duda has some quality items, very good customer service and super fast shipping. I purchased one of the stainless filter bags only and not the housing. It is thin material but well made. I cut the top 3-4 inches off, including the large ring, to use inside of a 2L 50/40 chromatography reservoir for steam distillation.

[Humphry Davy]

Well I have fast, medium, and slow paper filters, and I have purchased a filter bag from Duda and will attemp to use it in the inline strainer from glacier tanks I mentioned above.

However if that doesn’t work I’m looking for either an alternative to paper filters as they seem to clog up towards the end of the dump or a prefilter, that’s where I came across these microfiber glass filters.

Here’s their description from that PDF

Whatman offers two types of glass microfiber filters manufactured from 100% borosilicate glass: binder-free glass microfiber that is chemically inert and binder glass microfiber.
These depth filters combine fast flow rates with high loading capacity and the retention of very fine particles, extending into the sub-micro range. Glass microfiber filters can be used at temperatures up to 500° C and are ideal for use in applications involving air filtration and for gravimetric analysis of volatile materials where ignition is involved.
Whatman glass microfiber filters have a fine capillary structure and can absorb significantly larger quantities of water than an equivalent cellulose filter, making them suitable for spot tests and liquid scintillation counting methods. The filters can also be made completely transparent for subsequent microscopic examination.

The particle loading capacity of a filtration system can be greatly increased by using a prefilter. Whatman glass microfiber filters such as GF/B or GF/D are ideal because of the low resistance to fluid flow and high particle loading capacity. Whatman Multigrade GMF 150 is particularly valuable for the prefiltration of larger volumes and solutions that are normally difficult to filter.
Glass Microfiber GF Series
Binder-free Glass Microfiber Filters
Grade GF/A: 1.6 μm
Offers fine particle retention and high flow rate, as well as good loading capacity. Used for high-efficiency general purpose laboratory filtration, including water pollution monitoring of effluents, for filtration of water, algae and bacteria cultures, foodstuff analyses, protein filtration and radioimmunoassay of weak β emitters. Recommended for gravimetric determination of airborne particulates, stack sampling and absorption methods of air pollution monitoring.
This filter is available in the Whatman FilterCup. This is a convenient, disposable 70 mm filter funnel with a 250 mL capacity, molded from polypropylene with an integral, heat bonded filter. This filter is also available in the Whatman Disposable Filter Funnel. This is a convenient, disposable 47 mm filter funnel with a 250mL capacity. The 47 mm GF/A filter can be easily removed for further analysis or culturing.
Grade GF/B: 1.0 μm
Three times thicker than GF/A with higher wet strength and significantly increased loading capacity. Combines fine particle retention with good flow rate. Particularly useful where liquid clarification or solids quantification is required for heavily loaded fine particulate suspensions. Can be used as a finely retentive membrane prefilter. Used in LSC techniques where high loading capacity is required.
Grade GF/C: 1.2 μm
Combines fine particle retention with good flow rate. The standard filter in many parts of the world for the collection of suspended solids in potable water and natural and industrial wastes.
Fast and efficient clarification of aqueous liquids containing low to medium levels of fine particulates. Widely used for cell harvesting, liquid scintillation counting and binding assays where more loading capacity is required.
This filter is also available in the Whatman FilterCup. This is a convenient, disposable 70 mm filter funnel with a 250 mL capacity, molded from polypropylene with an integral, heat bonded filter. This filter is also available in the Whatman Disposable Filter Funnel. This is a convenient, disposable 47 mm filter funnel with a 250 mL capacity. The 47 mm GF/C filter can be easily removed for further analysis or culturing.

Grade GF/D: 2.7 μm
Considerably faster in flow rate and overall filtration speed than cellulose filter papers of similar particle retention. The filter is thick and consequently exhibits a high loading capacity. Designed as a membrane prefilter and available in sizes to fit most holders. GF/D will provide good protection for finely retentive membranes. Can be used in combination with GF/B to provide very efficient graded prefilter protection for membranes.
Grade GF/F: 0.7 μm
This high-efficiency filter will retain fine particles down to 0.7 μm. Unlike membrane filters with a comparable retention value, it has a very rapid flow rate and an extremely high loading capacity.
Because of the tight specification of 0.6 μm-0.8 μm particle retention and pure borosilicate glass structure, GF/F is the material upon which the EPA Method TCLP 1311 for Toxicity Characteristic Leaching Procedure was developed. It remains today the filter of choice.
Recommended for DNA binding and purification. Very effective in filtering finely precipitated proteins, GF/F can be used
in conjunction with GF/D as a prefilter for the successful clarification of extremely ‘difficult’ biochemical solutions and fluids, and nucleic acids.
This filter is also available in the Whatman FilterCup. This is a convenient, disposable 70 mm filter funnel with a 250 mL capacity, molded from polypropylene with an integral, heat bonded filter.
Grade 934-AH: 1.5 μm
The fine particle retention of this popular grade is superior for its high retention efficiency at high flow rates and its high loading capacity. This is a smooth surface, high-retention borosilicate glass microfiber filter which withstands temperatures over 500° C. Used for determining total suspended solids in water, removal of turbidity and filtration of bacterial cultures. Grade 934-AH is used for a wide range of laboratory applications. It is recommended for water pollution monitoring, cell harvesting, liquid scintillation counting and air pollution monitoring.
Quartz Filters – QM-A: 2.2 μm
High-purity quartz (SiO2) microfiber filters are used for air sampling in acidic gases, stacks, flues and aerosols, particularly at high temperatures up to 500° C and in PM-10 testing. Because of the low level of alkaline earth metals, ‘artifact’ products of sulfates and nitrates (from SO2 and NO2) are virtually eliminated. QM-A, sequentially numbered according to EPA standards, is suitable for most applications. See Air Sampling Filter/Quartz Filters section (p37) for
ordering details.
EPM 2000: 2.0 μm
EPM 2000 has been developed especially for use in high volume PM-10 air sampling equipment that collects atmospheric particulates and aerosols. It is manufactured from 100% pure borosilicate glass of special purity enabling detailed chemical analysis of trace pollutants to take place with the minimum of interference or background. See Air Sampling Filter/Quartz Filters section (p37) for ordering details.
GMF 150: 1 μm or 2 μm
The Whatman GMF 150 is a unique multilayer glass microfiber filter with a coarse top layer (10 μm) and meshed with a finer layer of 1 μm or 2 μm. Manufactured from 100% borosilicate glass microfiber, the filter is binder free. It is the ideal prefilter for higher particulate loading capacity with faster flow rates. See GMF 150 section (p34) for ordering details.

[Gray Wolf]

You might check with Ari at elephantfarm@gmail.com for a sock filter housing.

[Humphry Davy]

Originally Posted by Gray Wolf

You might check with Ari at elephantfarm@gmail.com for a sock filter housing.

Thanks GW, I tried that contact previously after seeing u mentioned it in an older post but did not get any response back unfortunately.

[Gray Wolf]

Originally Posted by Humphry Davy

Thanks GW, I tried that contact previously after seeing u mentioned it in an older post but did not get any response back unfortunately.

I reached him via phone recently and just sent a ping to the above address to see what happens.