multistage filter question

aviator8

Promoted Users
I followed the advice of many on here and got a proper multistage filtration and desiccant system, and put 50ft of copper cooling with drips between the compressor and filters, but I have one question on the one I bought, which is the same or similar rebranded that some here mentioned.


It came pre-assembled with the required desiccant. I filled it all up but in the circled area showing the view port to detect the desiccant color change there is clear sight glass, and behind it there is a brass fitting with two small holes maybe 1/16" diameter. I don't understand how Id be able to se the blue change to pink. I called usaweld and they referred me to the supplier, Arrow. I called them but cant get anyone to call me back, so I thought I'd try here.

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"Theoretically" the paper changes color over time due to moisture. It's not very accurate. Best to open up the canister occasionally and look at the actual color of the desiccant. When it turns pink it needs to be changed or dried in an oven.
 
That Arrow desiccant canister most common complaint is the sight glass from my internet readings, so you're not alone. Use a magnifying glass to see the desiccant color change. I don't know what state you live in and your humidity levels, or the kind of air compressor you have but, If you have a lot of moisture moving thru your lines, you could be changing desiccant beads every 2-4 days if you use your air system every day.

Not trying to spend your money but, your system will be 100% complete and up to the task of moisture free painting by installing an Air Dryer. You can buy one for around $350-$500 if you're frugal.
 
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Not trying to spend your money but, your system will be 100% complete and up to the task of moisture free painting by installing an Air Dryer. You can buy one for around $350-$500 if you're frugal.
I did the copper in leu of a dryer. I had to get a better filtration setup anyway and had copper on hand so used it to save money. I'm just a home hobbyist and don't do heavy amounts of spraying.

I don't have that exact filter but on mine I remove the sight glass and put some beads in there then reinstall.
I do have the same model and that is what I do as well.
Well that seems like a clunky design. I'll pull the sight glass and try that. See,s to me they could have just left the brass piece out and you could see the chamber contents.
 
I've ran an air dryer for years. I don't regret it,I wouldn't be without it. One of the wisest purchases I've ever made.
That Arrow desiccant canister most common complaint is the sight glass from my internet readings, so you're not alone. Use a magnifying glass to see the desiccant color change. I don't know what state you live in and your humidity levels, or the kind of air compressor you have but, If you have a lot of moisture moving thru your lines, you could be changing desiccant beads every 2-4 days if you use your air system every day.

Not trying to spend your money but, your system will be 100% complete and up to the task of moisture free painting by installing an Air Dryer. You can buy one for around $350-$500 if you're frugal.
 
I did the copper in leu of a dryer. I had to get a better filtration setup anyway and had copper on hand so used it to save money. I'm just a home hobbyist and don't do heavy amounts of spraying.



Well that seems like a clunky design. I'll pull the sight glass and try that. See,s to me they could have just left the brass piece out and you could see the chamber contents.
I removed the sight glass and put a few beads in it.
Was skeptical it would work and I kept opening the canister and checking.
Turns out to work great. The beads in the sight glass turned color when they were supposed to, and easy to see.

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I use it as hobbyist, only have to dry the beads about every 6 months.
I only run paint gun through the dessicant canister, not air tools.
Not very humid here in the pacific northwest.
 
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