I might suggest that you post this in the Houseplants forum or Garden Clinic Forum if you don't get some good answers here.

I'll suggest that you make sure you are watering correctly, since soluble salt build up is largely preventable. Flooding with bottled water could be helpful, too. If you aren't able to leach the soil system out each time you water (or at least frequently), then nothing can help a very sensitive plant. The product you mention won't work unless you can leach the soil when you use it.