Maddog booster pump

do you think that it still needs a mostiure filter ?

That depends on your supply air to the booster pump. If your supply air source is dry from a scuba tank with lower pressure and not enough to fill your airgun and you are using that as your supply air then I don’t believe you will need a moisture filter. If you are not sure if your supply air then an filter is recommended. For example on this setup I’m using a scuba tank as my supply air which is filled up to 3000 psi from my scuba compressor then it’s use to boost to my CF tank then their is no need for a moisture filter since my supply air is dry. 
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This is my airguns tank filling setup.

1. Top up CF tank with scuba compressor to 4000 psi (don’t want to over work my compressor even though it’s rated at 4500 psi)

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2. I use an extra scuba tank as my supply air for the Haskel booster to booster the CF tank from 4000 to 4500 psi. The shop compressor is used as my drive air for my booster and the red scuba tank is used as the supply air as shown here.

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I builded my booster setup as it can be driven by the supply air with a regulator regulating the scuba tank air down to about 150 psi as that the maximum drive air the Haskel booster needs as shown here on this video. 
https://youtu.be/5ly0-vSAgl4
 
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by the way Alkin sell parts and my opinion is that it has one of the best filtration systems its a little expensive $600 + but thats with all the valves that you need for it to work properly it comes with a aluminum interior canister that you can repack yourself $24 or you can buy the disposable plastic filters for $54 it has two 1/4 ntp where you can add your air source and what your filling
 
do you think that it still needs a mostiure filter ?

My understanding is that the Ayrtekk booster is driven by either shop compressor or Tee from Scba tank with regulator. If you are using shop compressor as a drive air source for the booster then a oil/moisture would be recommend it as you don’t want that to damage the o-rings inside the booster pump. On the other hand if you are using the Tee from the Scba tank or using a second Scba tank with regulator to drive the booster and know that the air inside your Scba tank is clean then no additional filter is needed. In my setup I fill my tank with a scuba compressor which is rated for breathing air (with grade E breathing air filtration) then I’m comfortable with knowing that my supply air the be boosted by the booster is clean and dry and the shop compressor is only used as the driver for the booster. I do have a oil/moisture filter attached to the input side of my booster pump just right before the shop air hose. 
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Unlike the Shoebox booster which uses the air coming from a shop compressor and boost it up to 4500 psi. As this happens condensation build up as you boost air coming from the shop compressor so oil/moisture is highly recommend. More importantly a moisture filter should be used on the outside side of such booster.