I suspect that the fine particles of MTS will migrate down to the bottom of the planter within a few months, and then out the drain holes. I used MTS, that I made, in some planters, with pool filter sand, and it didn't work well at all, compared to just plain Flourite-type substrate-actually the very dark clay based substrate you sent me. Only after I removed the pool filter sand from one of the planters did I realize that there was no MTS in it! And, finally I remembered that fine particles always settle down under coarse particles.
However, since you are having good results with your MTS, something else (probably the sand I used) may be the cause of my less acceptable results. Still, I feel much more comfortable with plain clay based substrate, fertilizing separately.
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