A few weeks after my first WC build I noticed my clear Tygon tubing was fogging up. At first I thought it was algae or some other bacterial growth. But after searching the internet and a forum post, I came to the conclusion that it was plastizier in the tubing that was causing the discoloration. Apparently the 3603 tygons are infamous for this issue yet many people recommend this tubing.
So I ripped out all the tubing and ordered a new brand. Primoflex Pro LRT this time. But as an experiment, I mixed both the tygon 3603 and the primoflex in the same loop.
Yet after only a month. Look at the results...

Seriously, why would anyone recommend or use Tygon? It's expensive as hell, and turns into this fugly color after only a month. Now I know most people use colored tubing/dyes, but even then. Do you really want this gunk in your loop? Discoloring tubing and potentially clogging water blocks?
So there it is. Don't use Tygon 3603 tubing.
So I ripped out all the tubing and ordered a new brand. Primoflex Pro LRT this time. But as an experiment, I mixed both the tygon 3603 and the primoflex in the same loop.
- Same water.
- Same loop.
- Same conditions.
- Installed at the same time.
- Distilled water, Silver Coil, 2 drops Dead Water, nothing else
Yet after only a month. Look at the results...
Seriously, why would anyone recommend or use Tygon? It's expensive as hell, and turns into this fugly color after only a month. Now I know most people use colored tubing/dyes, but even then. Do you really want this gunk in your loop? Discoloring tubing and potentially clogging water blocks?
So there it is. Don't use Tygon 3603 tubing.