ah! muriatic for something as simple as coraline on a pump? That's overkill to the max!
Just go to safeway and get one of those giant 4 or 5 litres of regular table vinegar. fill a large bowl, you can even dilute it 50/50 with no decrease in effectiveness in my experience, you might even be able to dilute it more but I'm impatient lol.
It will have your pumps looking like the day you bought them in a couple of hours. Just use an old toothbrush to periodically scrape away the red/purple stuff that become very slimy once the calcium has been dissolved.
No need to take any extra safety precautions unless you've got natural stone counter tops, in which case, do it somewhere other than your kitchen!
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