Combined filters work under a centrifugal system and are specifically indicated and designed for separation of solids and liquids found in large concentrations in gas f low. Combined filters design and construction ensure solid and liquid filtering with a high retention level and effective drainage for gases with high contaminant contents. The filter application ensures a gas flow free of solid and liquid particles, which usually cause serious damages to gas equipment, in addition to damaging piping as well as other metering and controlling equipment The single cyclone filters are highly efficient to control particles over 10 micra, however, in some applications the need arises for smaller particle retention, and for this kind of application Gascat has developed a line that matches, in one single housing, cyclone filtering and then finer filtering with micronic or coalescent elements, providing a solid and liquid-free gas The combination of these filters allows for smaller facilities and saves time during stoppage and servicing operations. The single cyclone filter elements do not need to be changed or cleaned, as they are designed and built in one single welded and fixed structure, allowing for a simple, safe and cost-effective operation Meters, liquid level gauges, pressure valves and switches as well as other fixtures may be supplied upon demand.