How quiet are these filters supposed to be? I have had 2 AC50s and 2 AC70s now, and the only one that has been dead silent to the point I have to touch it to see if it works is the first AC50. The other 3 have rattled no matter what I do. I switch impellers and the noisy filters impeller rattles in the quiet AC50. Got a new AC
, this time an AC70 and the same thing happened. I had finally had enough and exchanged it for another AC70 and it still makes noise. I have checked the impellers for damage and I can't find anything. I have am at my wites end with this brand. People swear by them, but right now I swear against them. If this most recent one doesn't quiet down by sunday its getting booted and replaced by a sunsun.
My on time delivery to the East Coast has been better than these ACs...
Back to the original question how quiet are these filters for everyone on a scale of 1-10? 1 being you can hear a pin drop next to it and 10 being water splashing from a HOB
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a 29 gallon high tech planted Chasing Red
, a 20 long low tech, and a 75 gallon salty adventure