Quote Originally Posted by mongoled View Post
I had the 'black' stuff cover my XT.

I guessed the reason was the following

1/ I had added a small amount of vinegar to the distilled water
2/ I use a silver cap on my reservoir
3/ The silver cap reacted with the copper and vinegar to coat my XT in black stuff.

This is what I guess happened.

My loop has been redone for about 3 weeks now, no more vinegar, just distilled water and the silver cap on the reservoir.

Will take a look at the XT some time in the future to make sure it is still clean.........
TBH, I doubt silver will react to vinegar in the water. It's pretty inert to vinegar.

AFAIK, this phenomenon is occurring only to distilled water setups so it's related to the water. There are a couple of variables:

1. Distilled water is slightly acidic due to the amount of CO2 dissolved in it. Acidity depends on the manufacturer and how much it has been exposed to air prior bottling and after we've opened it.

For the guys who have this problem, is the distilled water fresh? or has the bottle been opened and exposed to air for a few days?

2. Rads - Were the rads thoroughly flushed prior to usage?

3. Was PTNuke used in the system OR just pure silver? How much PTNuke was used? (4 drops for 1 litre is the normal amount)

Wes