I have used these Hydrotech filters for many years. This year two new activated carbon filters had black spots. I sent them back and got a replacement. The same thing. Tried to contact Hydrotech. No Answer. I thought the black spots might be due to carbon material leaking out. Replaced filters with these. Please note that I have also replaced the expensive reverse osmosis filter and one other filter included in this kit. Spilled water through the filters to fill the tank at least 3 times. The water has an unpleasant smell. (Note that my tap water has no odor). Tried to contact Hydrotech through their website. No response after 3 days.
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