I have no idea. I'm wondering if you could A. look at the manual that came with it, B. call the store you got it from or that sells that same brand C. call the manufacturer or D. google the company and ask directly online about it.
Sounds like calcium/lime build up. If you can remove the jets try soaking them in white vinegar. If you can't remove them, try scrubbing them with an old toothbrush and vinegar. The vinegar will help break down the calcium or line.
This works well with shower heads too. Just remove the head and place it in a basin of vinegar; let set for a couple/few hours (depending on how bad it is). You may have to use a tooth or other small brush to remove some residue, and if the item is really gunked up, the process may take longer.
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