Users in the airgun community on platforms like
Airgun Nation and
Reddit have documented filling 9L tanks with the GX CS4 (Serpent Arms). While these are unofficial reports, they provide specific performance data:
Reported 9L Filling Performance
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Complete Fill (0 to 4500 PSI): One user reported successfully filling a 9L Acecare tank in approximately 3 hours and 29 minutes.
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Top-Off (200 bar to 300 bar): For a 9L SCBA tank, top-off times are reported to be around 30–40 minutes.
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Estimated Continuous Time: Based on the factory output rate of 11 liters per minute, a full fill for a 9L (60-minute) tank is mathematically estimated at roughly 4 hours.
User Tips for Filling Large Tanks
To preserve the life of the compressor when exceeding the official 6.8L limit, experienced users suggest the following:
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Session Filling: Break long fills into multiple sessions (e.g., 45-minute intervals) to manage heat, even though the unit is rated for 5 hours of continuous work.
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Moisture Management: Users recommend cracking the bleed screw every 15 minutes during long fills to purge moisture, especially in humid environments.
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Secondary Filtration: Many users add an inline moisture/oil separator (like the GX Filter) as a backup to the built-in system when filling high-volume tanks.
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Input Boosting: Some advanced users have "boosted" performance by providing 2–10 PSI of regulated shop air to the compressor's intake, which one source claimed increased output to nearly 13 liters per minute.
