Healthy soil and sustainable growing

[BT Benjaminson <btbenj@netvision.net.il>]

Dear list,
I'm cobbling together a rather casual greywater system.
Some questions
1. If the greywater is made alkaline by the presence of conventional soap, 
shampoo, dishwashing detergent, or (a little) laundry detergent, can I 
neutralize it by having it come in contact with some half-composted horse 
manure towards the end of the process? I think that is acid and if I 
remember my high school chemistry from decades ago, it would neutralize it.
This is after it filters through sand, pumice, pea gravel, gravel, and soil.

2. Does anyone think there is a problem growing cucumbers from water thus 
filtered? Much to my amazement some Chinese cucumber seeds I sowed around 
the greywater area sprouted vigorously yesterday.

Thanks in advance!
Bat-Tzion
Negev (semidesert) Israel