Question For Hand Pumpers (G9 HAND PUMP)

Hand pumps will condense the same amount of moisture as any other compressor or pump considering the same pressure and volume. Hand pumps are more problematic because they don't usually have any sort of separator on the output side. It is feasible to install a very small high-pressure filter in the output line but it will increase the effort required for each fill because of the wastage involved in having to precharge the filter body every time you top off your gun. Atmospheric humidity will have a big influence on the amount of water that your pump condenses. I would not worry too much about it unless you live in a humid area and are doing a lot of pumping.

if you detect moisture at the end of the hose its pretty critical imo .. alittle puff cloud at the bleeder is acceptable and you should try to bleed quickly so it does purge most of the moisture out ... other items are its best to pump indoors in the ac where theres low humidity, and break the pump down, dry and lube it often or it will corrode and ruin it ...

small air filters are on Amazon for$9.00 with 20filter refills ready to plug in line

https://www.amazon.com/gp/product/B07M8KTS9B/ref=ppx_od_dt_b_asin_title_s00?ie=UTF8&psc=1

When you compress air, you reduce it's ability to hold moisture. Cold air is not able to hold as much moisture as warm air. When you use a hand pump, do it in an air conditioned room and try to pump slowly. You want to compress the air but you do not want to heat it more than you have to. If your pump becomes warm to the touch, take a break and let it cool back down. If you are pumping very quickly and heating the air more than you have to, you are increasing the amount of moisture you will be transferring into your air rifle/pistol.

You should break down your hand pump every once in a while and dry out any water you find and lubricate it with pure silicone oil. You will always have some amount of water vapor in your airgun, and the only way you will avoid this is if you're doing dry nitrogen/breathing air OR if you have a post-compressor drying system composed of molecular sieves and other contraptions.