Machining coolant that stays clean extends tool life and keeps parts accurate, but not every shop faces the same contaminant. Some struggle with floating tramp oil collecting on top of the sump; others just need to strain fine particles out of liquids before reuse or disposal. That's why a head-to-head between the TECHTONGDA 208-240V Industrial Cutting Fluid Oil-Water Separator Oil Skimmer 3-Phase and Duda Energy's Welded Industrial Filter Sock Bags makes sense: they are two fundamentally different filtration separation tools with a price gap to match.
Quick verdict: If your main problem is floating oil in a sump and you want continuous, automated removal, the TECHTONGDA separator is the system-level fix. If you need to remove fine particles from a batch of liquid and want a ready-to-use consumable in bulk, Duda Energy's welded filter sock bags deliver at a fraction of the price.
| TECHTONGDA Oil Skimmer | Duda Energy Filter Sock Bags | |
|---|---|---|
| Price | $1,886.00 | $327.83 per lot of 50 |
| Type | Powered oil-water separator | Welded filter bags with plastic ring flange |
| Key specs | 208-240V, 3-phase | Size #4 (4" x 14"), 0.5-micron rating, qty 50 |
| Best for | Removing floating oil from cutting fluid | Fine particulate filtration of liquids |
Where each product wins
- TECHTONGDA wins if you need automated, continuous removal of floating oil from a cutting fluid sump. It also recovers separated oil for reuse and has a cleaning valve for sludge removal.
- Duda Energy wins if you need a large volume of disposable filter socks for fine filtration down to 0.5 micron at a much lower upfront cost. The welded construction avoids needle holes and thread contamination.
TECHTONGDA 208-240V Industrial Cutting Fluid Oil-Water Separator Oil Skimmer 3-Phase
This is a powered machine built to extend the life of cutting fluid by separating floating oil from the fluid. The 208-240V three-phase motor makes it a permanent piece of equipment rather than a disposable. Its oil recovery feature lets you reuse separated oil, and the cleaning valve is designed to remove sludge from the tank. Choose it if your shop runs machine tools with sumps that accumulate tramp oil and you want hands-off maintenance. The limitation is the price: at $1,886, it's a significant investment, and it's a 3-phase unit, so it belongs in a facility already wired for that kind of power.
Welded Industrial Filter Sock Bags Plastic Ring Flange Water Liquid Oil WVO Fuel
These welded filter sock bags come as a lot of 50 in Size #4 (4" x 14"), with a micron rating of 1/2 - 0.5 microns, so they're aimed at fine particulate removal from water, liquid oil, WVO, and fuel. The welded seams eliminate needle holes and thread contamination, and the plastic ring flange with handles makes them easy to pull from a filter bag housing. Choose them if you're looking for a ready-to-use consumable at $327.83 per lot and don't want to invest in a machine. The limitation: they only filter within their bag size and micron rating, and they're not designed for oil-water separation; they're single-use bags that need to be swapped out.
Final choice by use case
For continuous sump oil removal, choose the TECHTONGDA. For high-volume fine filtration on a budget, choose the Duda Energy bags. If you need both, they can be used together: skim the oil, then polish the fluid with the socks.
