These medications may also be used to treat thyroid cancer or other thyroid conditions. The long-term safety of levothyroxine is well established. Typically side effects only occur due to overdosage of the medication. For more specific information, consult with your doctor or pharmacist for guidance based on your specific condition and current medications.
My neighbor just puts 3-4 gal of bleach down the pipe, then waits 24 hrs. Then runs water through all the fixtures until the bleach smell is gone. He said it usually last for 1-1/2 years. Our water is relatively soft, but does have a bit of iron in it.
Close to a quarter of the 6,934 memory-foam mattress owners surveyed indicated that it took three to 10 days for the smells to disappear, while a little over half cited up to 20 days for the odors to dissipate. About an eighth of those surveyed indicated more than 20 days for the mattress to quit smelling.