Hi I have nothing against borax but just so you know what levels are harmful or have adverse effects I wanted to post this abstract from a study in the area. I would be keen to hear feedback, I unfortunatly can't access the study myself without paying to see it. So the limited information I have attained from this study is that you are safe to use borax as long as you can keep the levels at 175 ppm as (boron equivalent).
What sort of dose that is I do not know and would not like to go over it.
Now I have heard it is a great chemical for chelation of metals. Does it also chelate fluorides? This is really my main interest as fluorides are recommended to be kept below a certain level and evidence suggests I would be surpassing this. Not that I would no how to test this to be true.
One last comment the zeolite clinoptilite sounds brilliant for taking the heavy metals, I have done little research into it, all thoughts and responses welcome. Thank you
Here's the abstract:
In Sprague-Dawley rats the acute po LD50 values for borax were 4.5 g/kg and 4.98 g/kg in males and females. respectively; boric acid, 3.45 g/kg in males and 4.08 g/kg in females. In Long-Evans male rats the LD50 values for borax and boric acid were 6.08 g/kg and 3.16 g/kg, respectively. In 90 day feeding studies, rats tolerated both borax and boric acid at 525 ppm boron equivalent. Dogs displayed no adverse effect at 175 ppm of borax (as boron equivalent) and 525 ppm of boric acid (as boron equivalent). In rats, high boron levels at 1750 and 5250 ppm of both compounds caused growth suppression, decreased food utilization efficiency, degeneration of gonads and skin desquamation on the paws and tails. At the 1750 ppm level, both boron compounds produced testicular atrophy in all male dogs. Two year dietary feeding studies indicated that both borax and boric acid could be tolerated by rats and dogs at 350 ppm boron equivalent. Rats fed dietary boron compounds at 1170 ppm levels showed toxic signs which were found to be similar to those observed in subchronic studies. Testicular degeneration was also observed in rats and dogs fed 1170 ppm levels. Reproduction studies revealed that rats fed both borax and boric acid at 1170 ppm boron equivalent were sterile. Both compounds at 350 ppm boron equivalent had no adverse effect on fertility, lactation, litter size, weight and appearance.
EC: The above-referenced abstract is from ScienceDirect here.
Here is ppm conversion chart: http://www.peteducation.com/category.cfm?c=0+1305
Replied by Bill
San Fernando, Philippines