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Picture of my loop when I built it a 2-3 months ago:

bp_gunk_01.png

Notice the "copper" color forming on the BP fitting. This was not there when I built the loop. This is also NOT forming on any other fittings (rest are Koolance QDCs). I'm running distilled water w/ PHP Nuke Bio (not copper). The water in the loop looks clear when viewed through my bay res.

bp_gunk_02.png
bp_gunk_03.png

Any idea what's going on?

Thanks.
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Gaming Rig (R5E)
(17 items)
 
File Server
(13 items)
 
 
CPUMotherboardGraphicsRAM
Intel i7 6900K ASUS Rampage V Extreme Edition 10 EVGA GTX 1080 Ti FE G.SKILL Trident Z 32GB 3200 Mhz 14-14-14-34-2N 
Hard DriveHard DriveOSMonitor
1TB Samsung 960 PRO NVMe M.2 SSD (OS & Apps) (2) 2TB Western Digital RE4 HDs (Games) Windows 10 Pro x64 34” ASUS ROG Swift PG348Q 
KeyboardPowerCaseMouse
Ducky Year of the Monkey (Red Cherry MX) SeaSonic 1200W SS-1200XP3 80 Plus Platinum PSU CaseLabs Mercury S8 Logitech G502 Proteus Spectrum 
AudioAudioAudioOther
Parasound Zdac v.2 USB DAC (2) KRK Rokit 6 Monitors (XLRs to DAC) Sennheiser HD 650 Headphones APC SMT2200 UPS Tower 
CPUMotherboardRAMHard Drive
Intel Xeon E3-1230 3.2GHz SUPERMICRO MBD-X9SCM-F-O C204 Micro ATX Crucial 16GB DDR3 ECC (2) Western Digital RE4 250GB (RAID 1 - OS) 
Hard DriveHard DriveHard DriveOS
(4) 4TB Western Digital RE4 (RAID 10 - File Sto... Western Digital 1TB 10K VelociRaptor (Virtual M... 6TB HGST Deskstar (Backup) Windows Server 2012 R2 Standard 
PowerCaseOtherOther
CORSAIR 520W CMPSU-520HX  iStarUSA D400-6SE-BK 4U Rackmount Chassis w/ i...  Intel Ethernet Server Adapter I350-T4V2 Adaptec RAID 6805 2270100-R 6Gb/s SATA/SAS w/ 5... 
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APC SMT2200RM2U UPS 
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