As often as needed, same as with any plant in a pot. Are you saying you're growing your trees ONLY in pond baskets and that none have gone into pots? What am I missing?

Nothing.
I use the same mixture of soil as in my pots and believe the idea is as the roots grow they are able to get more oxygen and are pruned by the air as they reach outside the basket holes.
It has worked well for me on all but collected trees which will now be planted in wooden boxes. I don't think the baskets are the reason for losing the collected trees but I don't want to take a chance.
I don't think I should have to change the soil as often because the roots are being air pruned and the soil is grit, turface, and sphagnum moss. Once the basket is filled with roots, yes I understand the soil have to be changed but how long does it take to fill the pot.
I took the oldest(2 years)Japanese maple planted in a basket out of the basket And there is still plenty of room for root growth and no circling of the roots.

I am experimenting with these in-ground.
In my garden, I've been sizing-up succulents during the summer, but I want something
to protect the roots and also allow for lateral root-growth. Pond baskets seem to be
a good choice.

Josh

Found the original article on water basket.
The way I understand it collected trees should be in wooden boxes until the tree is growing well and is healthy. It should then be planted in a pond water basket or one of Vance Woods screen boxes for training until it has reached the design of the grower and at that time planted in a bonsai pot.
One of the things I'm not sure of is how to handle nurseries trees. Should the nursery soil be changed, the roots pruned, and then go directly in to Water baskets for training???
Does any one have something to add or correct???

Yes, the soil should be changed out completely (at the species-appropriate time of year).

When I do a re-pot, I remove all the old soil, and I prune the roots to correct circling or
over-lapping, and to increase the fine, shallow, radially-arranged feeder-roots.

After a re-potting, I allow the plant to recuperate in a protected location for at least a week.
The plant won't be transpirating/photosynthesizing at full capacity, so it won't be able to handle
intense sunlight or heat. Plus, a slightly cooler container / soil is conducive to root-growth.

Josh

Some pics of the baskets I'm using:

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Except for the color they look like the baskets I have been using.
Did you buy them on line or from a local store.
Paul3636

Hey, Paul.
I bought these at a local nursery.

Josh