I have a silo tank witch uses the nautalis bvc coils. My first set of coils lasted well over a month, the second set lasted about 2 days per coil, either getting burnt taste or gurgling. Even after returning them to the shop where they said they could " fix or clean" them, no change. Bought a new pack of bvc, so far the first coil is slurping after only 2 days. I have completely dis assembled and re did all the o-rings on the tank. I don't run it over 4 volts even though says they can do over 6. Any ideas are helpful, thanks