White color on pots and soil

On the soil of several plant containers there's a white color.
Is this a fungus or something else?
Is it harmful?

What to do?
Thanks

Should i remove just the white parts, or all soil in the pot?)

Thumbnail by Pashosha Thumbnail by Pashosha Thumbnail by Pashosha
Cleveland,GA/Atlanta, GA(Zone 7b)

I answered this recently. It is a harmless mold that is breaking down the compost in the soil. Leave it. On the other hand, old pots that develop white crusty rings around their edges should be emptied and pots scrubbed clean. Plants should then be repotted in fresh soil. That is mineral deposit build up from water and will damage plants.

Thank you for your explanation. Much helpful.

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