I have had two Shark professional, one died in 4 months the other died in 6. They both just one day quit working. Every iron I have ever owned (many) spit brown yucky water. I try to over steam, this is why they do that.
I bought a gravity feed iron, professional grade, like the one a friend in the sewing business has. Cost no more than a Rowena. I have ironed up to 100 yds of fabric before I have had to refill the water bottle.
It does spit water and brown (I used distilled in it, so that does not matter)but that is because I push the steam button to many times and the water does not have a chance to steam only to puddle.
I am now trying to not hit the steam button all the time. And I am doing much better.
It is better, as many here have suggested to just use a misting bottle of water.