Filtration separation is not a single purchase category. It is a series of decisions based on what you are moving and what you are trying to keep out of it. Solvent filtration, water filtration, compressed-air filtration, and nitrogen separation all solve different problems. The four options below span that range, with prices from $49.99 to $1,500, so the first step is to match the hardware to the fluid or gas stream.
Quick take
The quick read: the Process Filtration set is the volume water-filter option, the Black Aluminum kit is the solvent-line trap, the High Flow air filter is the inline compressed-air unit, and the Green Air membrane is the nitrogen production component.
Listed price comparison
| Product | Listed price | Price indicator |
|---|---|---|
| Black Aluminum Industrial Grade Solvent Filtration Kit | $76.47 | |
| Process Filtration P/N: 3P879 T15R10A Water Filter QTY (6) | $49.99 | |
| High Flow 5 Micron Industrial Air Filter with Auto Drain & Metal Bowl | $73.99 | |
| Nitrogen Membrane Separator Medical/Industrial/Processors/Beverage | $1,500.00 |
Decision matrix
| Use case | Natural fit |
|---|---|
| Solvent or oil line with 1/2x28 fitting | Black Aluminum kit |
| Multiple water filter positions | Process Filtration T15R10A set |
| Compressed-air line with 3/4 NPT | High Flow 5 Micron Air Filter |
| Nitrogen production | Green Air Nitrogen Membrane |
Product notes
Black Aluminum Industrial Grade Solvent Filtration Kit
Designed as a compact solvent filter trap, this black aluminum kit includes a 1/2x28 fitting and is meant to drop into an existing line without special tools. Installation is tool-free, and the design can intercept impurities and particulate in oil, providing a layer of protection for engine or exhaust components. In new condition at $76.47, it sits in the middle of this group. Choose it for a small-scale solvent or oil line where you want a lower-cost inline trap. The limitation is the 1/2x28 interface: if your line uses a different thread, you will need an adapter, and the listed dimensions are compact.
Process Filtration T15R10A Water Filter Six-Pack
This is a six-count set of water filters with the Process Filtration brand and part number 3P879/T15R10A, made in the United States and priced at $49.99. It is the least expensive option in this group and the only one sold as a multi-cartridge bundle. For someone who needs to refresh multiple water filter positions at once, that count makes the per-unit cost friendly. The trade-off is the condition: it is new open box, so the carton may have been opened even though the filters are new. These are water filters, so they belong in a water filtration line rather than an air or solvent application.
High Flow 5 Micron Industrial Air Filter with Auto Drain & Metal Bowl
This compressed-air filter is rated for commercial and industrial systems and uses a 3/4-inch NPT connection. It filters at 5 microns and includes an auto drain plus a metal bowl, which means less manual draining on a shop air line. The new unit is priced at $73.99 from merchant j-ySBQ53TC. The obvious use is protecting pneumatic tools and accessories from moisture and debris. The limiting factor is temperature: the rating tops out at 140°F, so this filter is not suited for a hot air line. Choose it when you need a self-draining, metal-bowl filter and the 3/4-inch thread size matches your setup.
Green Air Nitrogen Membrane Separator
This is a very different purchase from the other three. The Green Air nitrogen membrane was previously used to produce nitrogen for a high-demand draft beer system and was pulled when the location closed. It is sold as the membrane only, without the compressor or tanks that supported it. The unit is about 45 inches long, 6-8 inches wide, and roughly 30 lbs, with a 200 PSI rating. At $1,500, it is by far the highest-priced item here, and the used condition means the buyer is taking on a component with prior service. This makes sense only for a buyer who already has a compatible compressed-air feed and understands the output needs of a beverage or industrial nitrogen application.
Final recommendation by use case
For a low-cost water filter refresh, the Process Filtration six-pack is the straightforward starting point. For a small solvent or oil line, the Black Aluminum kit gives you a tool-free trap. For compressed-air tools, the High Flow air filter is the better fit. For nitrogen, the Green Air membrane matches that specialized need if the price is within budget.
