Problems with Fluid-XP.
 

There are 2 drawbacks to using Fluid-XP. First, the inside of clear tubing looks terrible after about a month. second, when I removed a section of tubing after a few months of use, looking into the end of the tube I could actually see raised clumps of deposits, similar to sand banks in a river bed. I don't know if this coolant would work very well with any blocks that have small holes, unless the pressure created by the design of the block would be enough to keep the flow paths open.
Cathar-Have you run across this yet? I was drooling over your new block, but wouldn't try it with Fluid-XP without your input.
My camera isn't able to focus close enough and the flash washes the detail out, so no pics. Is any one using this coolant able to take photos?

I ran fluidxp for about a month or more with no problems. I reworked my wc system for pumps in parallel and that's when I noticed a sediment sort of like what you describe ...mine is white and gunky. Again about a month or so later I reworked the wc system into series and the sediment no longer appears. With each reworking I used fresh fluid.
A few things may be happening. Either fluidxp doesn't like high flow ...or some other contaminate gets into the line somehow and reionizes the fluid. Maybe the people from fluidxp might have an explanation.
I hope it's not a flaw in the product because I really like the stuff.

My system is in series. I will be trying to integrate a pressure gauge into the loop so i don't have any flow #'s. I noticed the same "goop" at first and after I refilled my system reusing the original fluid. I like it too.

What tubing did you use? If it is clearflex, I have noticed the same cloudy white deposits as well with distilled water. It is the clearflex and not the fluidxp... switch to tygon and you wont get that.

Yes, I am using Tygon, Primoflex and clearflex. This is interesting-sounds like the clearflex! I will be removing the Clearflex and using all primoflex.
Thanks for the info!

We covered many questions about this product, unfortunately, we came up short on answers:
http://forums.procooling.com/vbb/showthread.php?t=9662
and
http://forums.procooling.com/vbb/showthread.php?t=9726

In short, it contains:
Xanthan Gum, [CP Kelco: Keltrol-T &/or Keltrol-T622]
1-Dodecanol [Lauryl Alcohol]
1,2-Propanediol, [Propylene Glycol]
1,2,3-Propanetriol, [Glycerin]
and of course, water.

MSDS is available from the WBTA forums, along with conductivity test results, and an integrity test.

Interesting ...on the last build I used some tinted tubing from a local aquarium shop ...it was something they use for outdoor ponds and I find it more durable and the same cost as clearflex. I don't use clearflex at all anymore and I don't notice any more of that residue either.

thanks ben I had to read both threads in their entirety!