>I asked a chemist today about the poly coating and he said it's coated for
>good. But then again I have no idea how long his forever is.
Yes, recently I have the notion that the scare about using old tires was probably an exageration, that is why I choose to ask directly the manufactures. I found some info today with emission tests done by U Michigan where they did not detect Cd leakage in shreded tires and by the USDA-EPA claiming that the Cd emission is probably not much of a problem, since Cd competes with Zn in the plant absortion process. Zn could be also tire related but because is part of the steel belt, not the rubber, soaker hoses seem to be Ok.
In any case I am glad I asked; I really find them the best way to irrigate beds in arid areas, drip does not come close since you can bury the soakers and not the drip tape. Once buried, the soil on top acts as a dry mulch and the relative lack of humidity there stops weeds from proliferating (I use straw mulches as well Ok). Also, the uniform humidity allows for intensive planting and with the irrigation tapes you are limited by the spacing of the drip holes.
Thanks and regards
Guillermo Romero Ibarrola
Comala, Colima, MEXICO
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