The Tank › Black particles in hot water
- February 1, 2005 at 7:45 pm #3226Guest
Kids have been getting out of tub w/ black smears all over them. Discovered that black particles are coming out of hot water only and range in size from Course Ground Pepper to approx 1/2″ long w/ irregular shape. Texture is rubber-like but smears like grease. Hard to remove from surface of tub, requires comet to clean. Local water authorities came out and said not coming from water source. Tested negative for Manganese or any natural occurence. Anode Rod seems to be in excellent condition, hot water tank is only 1 year old (whirlpool 50 gal). Help please![/color:b34b62fac9][/color:b34b62fac9][/color:b34b62fac9][/color:b34b62fac9][/color:b34b62fac9][/color:b34b62fac9][/color:b34b62fac9][/color:b34b62fac9][/color:b34b62fac9]February 1, 2005 at 9:14 pm #3228
Hello: I can just about bet that you have the braided stainless steel supply lines hooked up to your heater and that the rubber lining inside is decomposing. If so, replace them with the corrugated copper or stainless lines. The problem will be gone!
Yours, LarryFebruary 3, 2005 at 10:10 am #3245TCParticipant
Thanks for the idea.
Our water supply is all made out of PEX!
Do you have any other suggestions??February 3, 2005 at 12:57 pm #3247
Hello: What is between the PEX plumbing and heater? It is not normal to hook up PEX directly to the tank. Beyond that, is there any rubber or other flexible hose in the system? What you describe in your first post sounds exactly like what happens to rubber when chloramine is used to treat the municipal water.
Yours, LarryFebruary 9, 2005 at 8:24 am #3290TCParticipant
Thank you for all your good advise Larry.
Our Pex is directly connected to the top of the hot water tank, unsure if this is a correct hook-up (a plumber friend did it for us). Whirlpool had two suggestions. One of which was the Anode rod, it checked out okay. The other was the “heat trap”? They sent two little rubber items (shaped like a bowl, not flat). I guess they are located under the top of the tank where the Pex connects to the tank. We haven’t cut the Pex yet to get in there to see if they are dissentegrated or not. What is their purpose, and is it possible this is our problem. One mystery is that the kids bathtub has quit having the problem, like it has all been flushed out or something. Master tub is still having the problem. (same hot water tank)!
TCFebruary 9, 2005 at 12:58 pm #3291Randy SchuylerKeymaster
The purpose of heat traps is to lower standby heat losses, in this case by preventing hot water from flowing up into the piping outside the tank during periods of inactivity, where it will radiate heat away continuously. The rubber flaps replace another scheme that used a floating ball. Those caused complaints because the ball rattled.
Randy SchuylerFebruary 10, 2005 at 12:29 pm #3298
Hello: If only one tub has the problem now, it must originate in the plumbing rather than the tank. I’d start at that tub and work back to the heater, looking for anything other than PEX and copper. Also, is there anything else in your plumbing system, like a softener or carbon filter, that’s out of the ordinary? Do you have an expansion tank, for example? That would be a great source of rubber!
Yours, LarryNovember 12, 2006 at 11:47 pm #5538Mike DParticipant
We have a problem very similar to what you described. How was your problem resolved?
Mike DNovember 12, 2006 at 11:49 pm #5539Mike DParticipant
Our home has a similar system and problem with black specks in our hot water. We also have pex wiring and copper flex tubing to the water heater. What are the black specks? (Are they safe?) and how can we fix the problem?
Mike DNovember 13, 2006 at 8:13 pm #5547EjParticipant
Discovered that black particles are coming out of hot water only and range in size from Course Ground Pepper to approx 1/2″ long w/ irregular shape.
These are big pieces you are describing. Big enough not to pass through the aerator of most faucets. Of course tub faucets don’t have aerators. I would want to unscrew several aerators from the end of several different faucets to check if this condition exists. If you only have this appear at one faucet then suspect that faucet.
If you are positive it is rubber then the only places that rubber is used as mentioned is in the nipples on top of the heater as heat traps. Overall size of the rubber piece used in the nipple is about the size of a nickle. Copper flex hoses have a rubber o-ring at the thread ends. I would think if this much of the o-ring was gone then the hoses would be leaking. Pressure regulators at the houses water supply have a large piece of rubber used to regulate pressure. It could be this.
If you truly have checked all what have been mentioned then I would suggest buying a 3/4 inch line strain (about 12.00) and placing it on the heater’s inlet line. Wait a few days and check the screen. If you don’t see any rubber then place the strainer on the output side of the heater. By doing this you will narrow your search and be pointed in the right direction.April 5, 2011 at 8:39 pm #15707dougo4Participant
I had a similar problem with the hot water supply in my kitchen faucet. It turned out that the rubber lining for the braided steel supply line was deteriorating. I figure tubs are normally connected via copper (or PEX, as I learned here)… but if someone gets black flecks coming to a faucet, check the supply line coming from the valve in the wall =)May 1, 2011 at 6:16 pm #15935dknight5Participant
I found black flakes in my hot water about 6 years after installation of a new water heater. Replaced rubber flexible supply line with stainless steel supply line and the problem is gone. Attached are some pictures of the rubber supply line that caused the problem, the supply line cut in half showing the inner lining flakes, and some of the inner lining flakes on my finger. The flakes feel and smear like graphite and were making a mess of the kids bath tub.May 31, 2011 at 1:21 pm #16157needinghelpParticipant
Do you know if this problem appears if there is any chloramine at all in the water supply? Can you tell me how I identify the types of pipes/tubing you are suggesting I look for and eliminate? I’d like to take a look myself before calling a plumber.
Many thanks.May 31, 2011 at 2:49 pm #16158Randy SchuylerKeymaster
Braided stainless steel flex lines most commonly cause this problem. Copper flex lines and corrugated stainless ones don’t have rubber liners.
Randy SchuylerMay 31, 2011 at 3:48 pm #16159needinghelpParticipant
Thanks. I’ll google those cables so I can identify them.
What should I get in place of them? Is that something I could do myself?
Any idea why this is not mentioned during installation so we don’t have to spend hours and $$ trying to figure this out? How can we get word out that these hoses/connectors should not be used?
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