no hostility squiggs, but at some point you gotta use some logic in what you say brotha, i mean common man. I'm simply stating that to go through what you were talkin about is pretty ludacris logically if somone where to build a pool cooler; i'm slightly hostile about the computers though....I as well as over 6 of my close friends all have liquid cooled computers; some of my friend have multiple dedicated servers and host massive amounts of content, as well as running several actaul monitors each with windows, linux or mac operating systems running seperatly simultaneously......I don't claim to know or be formally educated on computer and server know how, but out of all 6 of them that have computer related degrees, none of them could take seriosly the idea of cooling a computer with water; it just isn't a logical idea, if you see how computers are cooled..........it just makes no sense at all......why cool something with water when you can cool it with freon.......which by the way all 7 of our computers liquid cooling systems use freon as the cooling liquid.....not a single one uses water.....they don't even use water to cool super-computers for shit sakes; so to me it is absurd to say somone would cool a computer with water rather then freon.....again thats just not logical.......After doing some research I see where you came up with water cooled pcs........Indeed people actaully use to be stupid enough to cool their pcs with water, if you research you see why they no longer sell water cooling elements but rather liquid cooled.......Just to bring you up to speed if your gonna use liquid cooled computer components then for your sake please use freon.....Water is just completely ill-logical....but indeed people use to use it. So sorry that i doubted you squiggs.......And the parts on those websites are for liquid cooling.....not water cooling, liquid...like pressurized freon.... Sorry for bustin your balls squiggs; hope you've been feeling better........Now let me introduce you to the most popular, highest selling, freon cooled desktop computer thats has literally owned the market for the last 8 years
http://www.dell.com/ed/p/alienware-area51-alx/pd ...........:D.......take it easy squiggs
I have been building my own rigs for about 15 years now--I am not without expertise when it comes to building computers. As far as the pool shit, I have no problem bowing out on that one if you say PEX is available for these types of fixtures. To my knowledge they aren't and that's why I made the suggestion. You make a good point about using copper.
If your 6 friends who are great with computers don't think water cooling for PCs is legit--they need to take their dumb asses back to school. Plain and simple.
You DO NOT use freon to cool ANY PC that you own, nor has it ever been used to cool a PC. Freon is illegal (because its eats the ozone layer, freon is a chlorofluorocarbon which are now banned in new products) and it boils at -51deg Celsius. Freon is NOT a coolant, it is a REFRIGERANT.
There are various chemical laden coolants which are used in PC systems, but most of these are either propylene/ethylene glycol mixtures, or they are simply water with a bunch of shit dissolved into them. The reason these are used is that despite using copper blocks to avoid corrosion--it is not desirable to promote buildup within the block as its very difficult to clean and a clogged block will kill your CPU/GPU quick fast and in a hurry if its under load. In fact we go to extra lengths to remove even microbubbles for this reason.
Water is a perfectly good coolant to use in a PC liquid cooling rig provided you are able to keep it free of contaminants. The special liquids which are often used are ONLY used instead of water because people don't want to go the extra mile to make sure they use very clean water.
Because I work in the chem department and have access to highly deionized water I didn't see the need to buy all of the "special" liquid that are marketed to
dumbasses. Please keep in mind that, while you're correct to say I've got little experience when it comes to building pump systems and doing all that type of engineering work--when it comes to chemicals and building computers you are all up in my wheelhouse. Liquid cooling is done with just exactly that,
liquid. Freon is not a liquid unless it is under high pressure, and that's not the type of cooling system which is used in a computer.
A computer is cooled much the same as a car is, by circulating
coolant (NOT REFRIGERANT) through radiators and through blocks which absorb heat from the motor (or chips). When you mention freon you're talking about refrigeration, which is how a car's A/C is run--not the cooling system for the engine.
I mean you can disagree with me all you like, but facts are facts--I'm typing all of this on a water cooled machine right now, and it's a beast of a fucking machine. It's been running for quite some time with no hiccups. It runs a 7.9 windows experience index rating (the highest possible score) in every category except my hard drive (because I don't need to write data fast enough to warrant spending $800 on a hard drive). That is nearly impossible to attain for most people.
Get at me if you want more stats, I'd be willing to share them with your buddies as well. Like I said, been doing this a looooong time--I know what I'm talking about when it comes to this.
Do most people cool with pure water? No. They mostly use the bullshit "special" water or some glycol mixture. I use pure water because I know about heat capacity and I know that water does the best job. Glycols are only used in cars because it's important that they lines don't freeze (hence why ethylene glycol mixtures used in cars are called "antifreeze").
Now as far as servers and shit like that, water cooling isn't really practical and maybe that's why your buddies don't have experience with it--but for high performance personal rigs its in widespread use.
Just go to youtube and type "water cooled pc" if you don't believe me. This has been the norm for 10+ years now.
Back to the topic, are the PEX water cooled hoods available? Furthermore are you sure that copper is the only metal that is used in these? I can't seem to find any info to that effect, and even if I could I'm not sure I'd trust it coming from chinese manufacturers.
Regardless of what the OP chooses to do I suggest that he watch his pool pH VERY CLOSELY while doing this, as that's really where his trouble will start if it does (regardless of what type of system he uses). 
