When you decide to go with water cooling your system things you should do and not do . A good case is a must one that can accommodate all your water cooling parts and accessories . One thing I would like to point out is that tubing is very important to a good cooling experience , You will see 1/4" and 1/2" tubing ( Mostly But there is also 3/8" ) 1/4" is not going to be very effective in cooling your entire system and is more restrictive , So choose wisely , If you plan to just cool the CPU it will be fine ( But not as good as a top of the line Air cooler ) , I went with 1/2" tubing with 1/2" fittings . This will give you maximum flow rate and less restriction . http://www.frozencpu.com/cat/l2/g30/c99/list/p1/Liquid_Cooling-Tubing.html For some a single 120mm rad will be fine for normal operation but for me and others you will need more , Dual 120mm and up are the best ( this will provide you with the advantage of adding cooling for other hardware in the future ) . Just remember the more you add to your cooling , video cards , MB , HDD , RAM , The more added heat you will have to remove ( cool ) , So choosing your RAD and the size of it is very important . And you can add RAD's to your setup when needed for even better cooling . http://www.frozencpu.com/cat/l2/g30/c95/list/p1/Liquid_Cooling-PC_Water_Cooling_Radiators.html The pump , Well there are many to chose from and you can add a second pump to your setup if you need to , Just chose a pump that best fits your needs and that can provide you with the maximum flow rate for what you are cooling . The more flow you have the more cooling you will get . http://www.frozencpu.com/cat/l2/g30/c107/list/p1/Liquid_Cooling-PC_Water_Cooling_Pumps.html Water blocks come in all types shapes and sizes , Choosing a good WB is very important as well , Some will restrict water flow , This will give you less than optimal performance when you need it the most . http://www.frozencpu.com/cat/l2/g30/c323/list/p1/Liquid_Cooling-Water_Blocks_CPU_-_Brand.html Now on to the reservoir , The use of a reservoir is always a good idea , You not only can keep an eye on how much water is in your setup but you can see it flowing as well . There are all types of water reservoirs to choose from getting one will also make it easier to fill and drain your system . http://www.frozencpu.com/cat/l2/g30/c97/list/p1/Liquid_Cooling-PC_Water_Cooling_Reservoirs.html Liquid coolant http://www.frozencpu.com/cat/l2/g30/c337/list/p1/Liquid_Cooling-Coolant_-_Brand.html , What should you use ? Well Distilled water is the best and the rest is just a gimmick . there are additives and coolants that can make it look cool , But that is about it , They do nothing to make your hardware any cooler than good old Distilled water will . There are the fittings as well choose what best fits your needs and tubing , I use 1/2" fittings with 1/2" tubing this provides a better seal for me . http://www.frozencpu.com/cat/l2/g30/c407/list/p1/Liquid_Cooling-Fittings-Barbs.html Also When connecting the hose to the barbs or fittings I suggest using hose clamps the screw type . No chance of leaks . I suggest this for testing . Once you have all your parts and you are ready to install it all . Take every thing out of the case ( MB , PSU ) any thing that might get wet or in the way . Put your new water cooling setup together just were you want it to go inside your case , Once you have it all setup and ready to fill , Do so . Hook up your PSU to the pump ONLY ! Jumper the PSU ( It should be out side the case and away from the water unit ) to turn it on , Fill and check for leaks , This is the point you will find them ( If you have any ) and be able to fix them with out ANY THING getting wet and / or damaged . If every thing checks out no leaks system full and functioning well . Put all your hardware back inside the case hook up your new LEAK free water cooling and have a cool time ! Never ever test your water cooling setup with your hardware inside your case , and never check it out side the case then take it apart and put it in your case with your hardware , As you will have to re-hook it up and re-test it ! and you just may get a leak and water all over the hardware ! Now I know this is more than a generic guide and less than perfect But I do hope this helps . There are also sealed units that come pre-built and ready for installation but they are just that . There are lots of things you can add to your liquid cooling setups as well . So I hope this helps people new to water cooling get a better idea of what they need and how to test . Good luck and have fun . Please feel free to add any thing you have to this .