Greasy feeling black specks in water supply in apartment. ?
seeking your advise. Have read many threads on here about black smeary specks in the water supply. In my case they buildup in toilet, aerators, around sink drains so not just isolated to hot water. Given what I am seeing and the smearing nature of the specs the most prevalent answer all over the internet is some piece of rubber gasket or rubber washer that is disintegrating based on reaction to regular chloramine treatment of water supply. These threads have been useful in narrowing the potential cause and have done many of the suggested fixes. so far I’ve done the following. First I checked with all neighbors who had same plumber and same timing of install of new water lines to our building about two years ago. we all have copper inside the building and the neighbors are not having the problem. Based on this the city water supply most likely isn’t the problem nor plumbers work since we all used the same guy same time etc To this I changed the hot water tank last august. We have crimped copper and not flexible lines on hot water tank, based on threads we have changed out all the supply lines to faucets and toilet , and changed kitchen faucet. Also Changed the diverter cartridge in shower. And flushed and drained the hot water heater twice. We have also determined the anode rod in our new hot water tank is aluminum. Also looked at exterior garden hoses to see if they have black rubber inside. after all that checked 4 weeks later and buildup is happening again. Shows whoever water touches including water pic :(. The only “hose” I haven’t changed that has rubber washers is the washing machine. Researching that now. any other ideas are appreciated. thx