STA Microfilter Clear Tube (CTS) – Self-Cleaning Fine Filtration
Microfilter · Made in Germany
Need crystal-clear water for CNC spindles or glass washers, or oil that looks like new? The STA Clear Tube is a back-flushing microfilter that removes particles down to 1–3 µm (cleanliness class NAS 7/8) – fully automatically and without filter cartridges, paper or filter aids.
Combined with an STA centrifugal separator it becomes a complete system: the separator cleans the main grinding fluid, the Clear Tube polishes a stream of clean water, and the slurry from each back-flush is sent straight to the separator, where it ends up as dry, compact sludge.

Key features
- Filtration fineness 1–3 µm (NAS 7/8)
- High throughput from a small filter area: 3.5–5 l/min per filter element
- No consumables and no filter aids
- Works with oil (including water-contaminated oil), water and emulsion
- Fully automatic, uninterrupted operation with periodic back-flushing
- Long filter service life
- Removes HSS, tungsten carbide and glass particles
- Dry sludge when combined with an STA centrifugal separator

Typical applications
Clean water or coolant supply for CNC machining-centre spindles · glass washing machines · grinding of carbide and HSS tools · honing and grinding oil.
Technical data
| Model | CTS-80 | CTS-120 | CTS-240 | CTS-360 | CTS-480 |
|---|---|---|---|---|---|
| Filter area (m²) | 2.5 | 4 | 8 | 12 | 16 |
| Flow rate (l/min) | 80 | 120 | 240 | 360 | 480 |
More STA products: Centrifugal Separators · Clear Tube System · Central Systems · Coalescers