It can, and will eventually, kill the system, but not everyone has access to/can afford RO/DI water, and it’ll take years to do so+1 except for the "if possible". This is the one thing that can kill the system.
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Tubing not attached yet. Tilting the reservoir allows more of the water to be usable instead of 2" sitting at the bottom. Reservoirs should have a lid to keep out flotsam & jetsam. A clear or translucent reservoir can indicate its level at a glance from across the room or house.
The pump sits in front of the reservoir—no screws or bolts. It's very quiet; if the TV is on or the fridge or dishwaser are running, you can't hear the mister.
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I use the filter that comes with the starter kit. A very short piece of tubing connects the filter to the bulkhead—keeps things neat & tidy.
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Tubing goes up the right side and across the top at the front. You can see the center & left mist heads/nozzles. Right nozzle is out of frame.
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Drain bucket takes a month to fill up halfway, at which time I dump it on the garden. The blocks under the back feet of the table provide pitch. I have a piece of hose that attaches to the PVC so the bucket can fit neatly under the table if desired.