I used the Arizona fill calculated and it said 9 times on a fill - I think I got 3 fills.

I purchased a 9.0L 4500 psi now I’m wondering if I should have bought a cheap compressor
No, a Tuxing dual cylinder that can easily top off the 9L bottle. With proper cooling (not the supplied pump) will fill the 9L from 0 to 4500 in about 75 minutes.

Or one of the GX pumps if you don't mind a long pump session.
 
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I plugged it into pyramid also. Something isn’t adding up. I assumed it’s a Sniper with 580cc bottle.

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I used the Arizona fill calculated and it said 9 times on a fill - I think I got 3 fills.

I purchased a 9.0L 4500 psi now I’m wondering if I should have bought a cheap compressor
You will probably want to purchase a compressor eventually. Like someone else mentioned a tuxing twin cylinder will handle topping off that 9L no problem. $389 on Amazon for the base model that I have. I upgraded my water pump, I have a 5 gallon bucket for a water tank and I have a two 8 inch fans blowing across the motor. You also need a pcp air water separator filter, and some synthetic compressor oil. Gx makes a good pcp filter. For around $550 you can get everything you need to fill your own tanks.
 
If your tank is at 4300 and you are only filling to 3625 your tank can still do several more full fills. Also you do not have to fill to 250 bar. Any fill above the regulator setting will give you more shots. I am not trying to talk you out of a compressor, just trying to understand your 3 fill comments aligning with your 4300 psi comment. Different tank fills?

You would need to do more than one run or do something more than just fill a drywall bucket with water but a Yong Heng is an inexpensive tank filling compressor. I only fill a 45 minute firemans tank but it does a typical refill (3200 to 4500) in under half an hour. I use ice bottles in the water and have a couple small radiators on it. Another simple way to enhance cooling is to constantly replenish the cooling water. Mine is 4 years old and I rebuilt it with a new piston earlier this year. Cost about $20. YH compressors are crude but they work and are inexpensive.
 
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