Ive never done reverse osmosis but Ive built water filtering fountains for my cats.
You'll want NSF grade (food grade) carbon from either bone or coconut shells with a fine enough mesh to provide resistance. I bought 10 pounds of this one and its still lasting over a year:
Next you'll want to get silver tubing and adapters to kill all bacteria. You'll also be able to connect your carbon filter inline with the tubing and use a pump to push your water through the filter.
This is the best NSF antibacterial silver infused tubing money can buy:
You can also find the clearflo tubing on usplastics but only in 100 feet rolls. I can ship some if you need only a few feet, my email is in my profile.
Next youll want a transparent/translucent inline refillable filter. I recommend a 1/2" FPT but you can get larger/smaller depending on how much water you want to filter and what your tubing, adapters, and pump size is, everything needs to match. 1/2" ID for tubing and 1/2" NPT / barbs is very compatible and provides enough flow for most purposes. Theres a lot of these on the market, here's a good google search that sources images from amazon, ebay, and some smaller vendors:
Unless you hook this contraption up to an actual water line( your sink), you'll need a pump to push the water through the carbon. No, gravity is not good enough - if the filter is worth its salt it will provide a resistance much greater than what gravity can provide.
I recommend Danner steel pumps. Their plastic ones suck, trust me, I've burned through a few. This pump has really shined:
Now if you choose to use this pump, go with 1/2" on everything. Here is a barbed adapter that will screw perfectly into the top of the pump and seal perfectly with 1/2" ID tubing:
I dont know much about Berkey filters. It looks like they are gravity powered. They might be weaker than the filtration you could accomplish with line or pump pressure.
You'll want NSF grade (food grade) carbon from either bone or coconut shells with a fine enough mesh to provide resistance. I bought 10 pounds of this one and its still lasting over a year:
http://www.buyactivatedcharcoal.com/product/granular_activat...
Next you'll want to get silver tubing and adapters to kill all bacteria. You'll also be able to connect your carbon filter inline with the tubing and use a pump to push your water through the filter.
This is the best NSF antibacterial silver infused tubing money can buy:
http://www.newageindustries.com/clearflo-Ag-47-antimicrobial...
I recommend NSF Eldon James antimicrobial tube fittings:
http://www.usplastic.com/catalog/default.aspx?catid=550
You can also find the clearflo tubing on usplastics but only in 100 feet rolls. I can ship some if you need only a few feet, my email is in my profile.
Next youll want a transparent/translucent inline refillable filter. I recommend a 1/2" FPT but you can get larger/smaller depending on how much water you want to filter and what your tubing, adapters, and pump size is, everything needs to match. 1/2" ID for tubing and 1/2" NPT / barbs is very compatible and provides enough flow for most purposes. Theres a lot of these on the market, here's a good google search that sources images from amazon, ebay, and some smaller vendors:
https://www.google.com/search?q=inline+refillable+filter&prm...
Unless you hook this contraption up to an actual water line( your sink), you'll need a pump to push the water through the carbon. No, gravity is not good enough - if the filter is worth its salt it will provide a resistance much greater than what gravity can provide.
I recommend Danner steel pumps. Their plastic ones suck, trust me, I've burned through a few. This pump has really shined:
https://www.amazon.com/gp/product/B000BJK3QQ
Now if you choose to use this pump, go with 1/2" on everything. Here is a barbed adapter that will screw perfectly into the top of the pump and seal perfectly with 1/2" ID tubing:
https://www.amazon.com/gp/product/B008TSRZJE
Let me know what you finally settle on and how it goes. Filtration is lots of fun!! Cheers! :-)