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Hello All,

I live in the Northern Hemisphere, (PNW), we have natural pumice filtered water here from the volcanoes. So it is fresh and we drink it from the tap. I usually fill up my watering spout with it. And then let it sit for 24 hours (started doing this for bamboo plants, was told this decalcifies the water). Once it has sat out for 24 hours, Ill then use it for my trees/seedlings, and such.

But as seen in the photo, there is some white buildup on top of the soil. I am not sure if this is some mineral or chemical from the water, or if there's some kind of fungus impacting the soil. (This soil is peat moss with perlite, I have more as well as some different substrates)

Mostly wanted help identifying what this is, but also open to feedback if there's a way to prevent it, or if I should repot my seedlings into fresh soil/substrate.

Decalcify by letting the water sit for 24 hours is one of the funniest myth I have ever heard. The Great rift lakes has been around for thousands of years. Water is still hard. You can stop this task, will make no difference to the water.

Exactly why I come here to get real knowledge and follow y'alls expertise. Thanks for letting me know!! :lol:

The best way to exclude calcium buildup on the soil is to use rain water.

I found rainwater to be extremely effective on situations like this. I hope you have a great time!

I would think in the PNW there would be a lot of rain. The seedling is outside in the rain, isn't it?

I am east of the cascade mountain range, so we don't get quite as much as the coast does. (They get 35 inches a year, we get 25).

But then rainwater, is the best bet. I planted these inside to start, and was recommended not to put them outside yet as they have not built up any frost hardiness. But we are past the point of snow, so maybe that's my answer, is putting them outside, relying more on rain water, and just watering as needed during dry spells?

exactly.
And next time, sow your seeds in pots outside. In spring they will germinate and will be resistant to a cold spell passing by. Nature knows how to germinate seeds. Just protect from predation.