why does my well water turn black
The injector may be too small and not allowing sufficient oxidation for the volume of H2S, iron and manganese in your water. The gallons of retention of your pressure tank is WAY too small; especially @ 50/70 psi. A lower pressure allows more drawdown gallons into the pressure tank and slows the velocity of the water down but. the tank can't refill when the pump is running unless the pump can deliver the gpm of the water use in the house and to refill the pressure tank. So the water going past the pressure tank to the fixtures using water, instead of into the pressure tank, it has no retention until it gets into the vent tank which is way to little and too late. The vent tank is WAY too small and, there is no mecanism that I can see to keep a head of air in the top of the vent tank; although there is a tube under the vent line that will not allow all the air out of the tankbecause there is a check valve in the vent line fitting that air can go through but not water. The head of air is needed to provide further oxidation of the H2S, iron and manganese after the retention (the length of time is critical).
All that led to failure of the carbon in the filter; it will be loaded up with H2S that the air doesn't oxidize to particulate matter. IF the carbon is regular carbon, that is a poor choice and will not last long even if the other problems were corrected. Then they installed the disposal cartridge as a small bandaid, that had the rest of the problems not been created, or corrected, it wouldn't be needed at all for anything. Also, the plumbing past the venturi (air injector) will be blocking up with gray/black/ from the H2S and mangnaese and rust from any iron and what doesn't cling to the inside of the pipe will be settling to the bottom of the vent tank with no simple/easy way to get rid of it and then get out into teh carbon filter causing the carbon to load up. The blocking of the water pipe past the injector will also reduce flow. And if enough of that happens, the filter can't get as much water as it needs to successfully backwash. I refuse to sell air injection systems because of all their problems but especially the last one; blocked pipe and water restriction.
I sold air pumps for some time but then went to an inline erosion chlorine pellet system with a mixing/retention tank equivalent to 120 gal retention tank followed by a special catalytic carbon in a correctly sized for the peak demand flow rate of the house backwashed filter. They never fail. You could replace your vent tank with the mixing tank and use your air injector and if it didn't work, go to the chlorine. The mixing tank is made to be used with air or chlorine and is plumbed for your vent line and the tube under it in your vent tank. BTW, you should check your vent tank 'head', the dark gray thing the pipes goe in/out of, to make sure it is plumbed correctly. IF it is an UPflow In/Out head, it has to be plumbed backwards so the water goes into the tank, down to the bottom and up the distributor tube and if there are flow direction arrows, they could have plumbed it wrong. If it is DOWN flow then the arrows are correct.
The only way to tell is to take it apart but, since this system worked for months, I don't think it is plumbed wrong. IF the air and H2S can't get out of the vent tank, that is a problem, and I see the line going down. That wouldn't allow the H2S to get out of the vent tank and get into the carbon filter.
1. Lake House that is not regularly used and in most cases the homeowners did not drink the water. 2. No baseline testing other than some historic testing for coliform bacteria and nitrate. 3. 4. Well - no drilling log- located in a river valley near a lake - over 400 feet deep. 1. Could not access well to measure LEL (Lower Explosion Limit) in headspace because we were in a natural gas area or measure the static water level for the well. 2. Started purging the well - no gas spouting or water hammer, but the gas in the water began to outgas quickly. 3. Water appeared very clear - other than the out-gassing of some gas very quickly. 4. Well near lake with on-site septic, natural gas development over 2000 feet away, dirt roads, and not urban runoff or salt storage. 5.
I had been to this house before, but I never drank the water - Again - this is a house at the lake - drinking water and measuring water quality is not the primary activity. 1. Collected a water sample and measured water quality in the field and sent a sample to the laboratory. 2. Results: Ethane- 0. 01 mg/L Propane- 0. 02 mg/L Strontium - 1. 8 mg/L T. Hardness - 61 mg/L Sodium - 264 mg/L Nitrate- 0. 5 mg/L (OK) pH 7. 8 mg/L 3. Findings - The well appears to be impacted by saline water. 4. Homeowner First Question - Was this caused by Marcellus Shale Drilling? 1. No Baseline Data or even historic testing data other than total coliform and nitrate. 2. No gas development within 2500 feet 1. Under Oil and When an operator or owner is notified of or otherwise made aware of a POTENTIAL natural gas migration incident, the PADEP may require the operator to conduct an investigation. Point - If the homeowner spent $ 300. 00 on baseline testing- we could have provided an answer. The POINT -
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