Making this a quick answer or suggestion.
Change the water flex hoses on your water heater cold and hot. The gaskets are black and are now leaking into the system.
Shut-off cold coming into your water heater, open the hot side of a water fixture to drain your hot line, and just unscrew one your hoses from the water heater and touch the gasket and you'll most likely see that same blank ink that you see and goes away.
I spent a lot of time at a service call on a home to finally figure this out and they had a very complex and after market products on their system. 3 or 4hours later it was just the flex hoses.
the black water comes from deposits in your pipes that build up over time, occasionally these will beak loose and cause the discoloration. they aren't hazardous just let the water run until it clears up. the only sure fire fix is to replace the pipes. and that's really not cost effective. just let the water clear up when it happens. so many factors can cause this the temp outside the water pressure someone working nearby shaking the ground or pipes. that's why its so random. It wouldn't hurt for you to drain the hot water tank as the deposits are likely settled in it as well. it's easy to do.
안녕하세요? 2013년 6월에 이사를 왔는데, 그 이후 한 두달 정도마다 수돗물에서 검은 먹물이 나왔습니다. 많은 양은 아니고 검은 물덩어리 같은 것이 나오고 그 다음에 다시 맑은 물이 나오더라고요. 그런데 요즘 들어서는 그 횟수가 잦아 집니다. 제가 생각하기에 주로 따뜻한 물을 쓸때 나오는 것 같아요. 화장실 욕조 수도꼭지에서 주로 나옵니다. 집이 방갈로인데 현재 upstair에 있는 두군의 화장실 욕조 수도꼭지에서 나옵니다. 지하화장실 샤워실에서는 확인이 잘 안되고요. 부엌 싱크대에서 뜨거운물을 자주 쓰는데 거기에서는 아직 나오는 것을 보지 못했습니다. 잘 아시는 분이나 같은 경험을 하신 분 있으시면 무엇때문에 그런건지 알려주시면 고맙겠습니다.
