What brand CF tank ?

I have a Great White with slow fill valve and dual gauges, one gauge for tank pressure the other for fill pressure, dual gauges make life much easier and I myself like the slower fill air restrictor, easier for me to get a more accurate fill pressure.

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For me it comes down to who fills the tank.

If it is someone like a Dive Shop, and in US/Canada, you have to have a DOT certified tank.

If you are filling yourself then the first question is how big a tank can your compressor support. Low end single cylinder compressors are limited to 1-2L. (they can fill larger tanks over multiple sessions but time spent at high pressure is hard on them).
Mid priced compressors like GX or Tuxing Dual cylinder can fill 6.8L and larger. GX are slow and Tuxing need 2 sessions for tanks over 6.8l.
High end compressors can fill all your tanks.
Once you determine how big a tank you can support your options are DOT and CE certified tanks. CE being the European standard. The difference in safety or quality is non existent. The actual difference is in the price. DOT certified tanks are 150% to 200% more costly.

Tuxing 6.8l CE tank is $168 on AliExpress. You would need a fill valve too. Valves are $50 on up. Slow fill valves are fairly pricy and really are not necessary when your main tank use is topping off or tethering a gun. But there are those that feel any heat expansion is detrimental to the tank.
 
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For me it comes down to who fills the tank.

If it is someone like a Dive Shop, and in US/Canada, you have to have a DOT certified tank.

If you are filling yourself then the first question is how big a tank can your compressor support. Low end single cylinder compressors are limited to 1-2L. (they can fill larger tanks over multiple sessions but time spent at high pressure is hard on them).
Mid priced compressors like GX or Tuxing Dual cylinder can fill 6.8L and larger. GX are slow and Tuxing need 2 sessions for tanks over 6.8l.
High end compressors can fill all your tanks.
Once you determine how big a tank you can support your options are DOT and CE certified tanks. CE being the European standard. The difference in safety or quality is non existent. The actual difference is in the price. DOT certified tanks are 150% to 200% more costly.

Tuxing 6.8l CE tank is $168 on AliExpress. You would need a fill valve too. Valves are $50 on up. Slow fill valves are fairly pricy and really are not necessary when your main tank use is topping off or tethering a gun. But there are those that feel any heat expansion is detrimental to the tank.


"GX are slow" is a very subjective quantity. I can take a 9L tank from 3200-4500 psi in an hour with a CS4, and about 20-25 minutes with an E-5K2.