I was at a LFS a couple of months ago and I learned that he does not use RO - he only uses DI to make the top off replacement water. I have been thinking about it since and with the summer months coming, I recently decided to collect the waste water from my RO unit to use it to water my garden.
I make 50g of RO water each instance and i collected approximately 100g of waste water. My input TDS reading is 8 and after RO/DI, my TDS reading is 0.
To make 50g of RO/DI water, I had to use 150g of water. If I made DI water only, 50g of water would yield 50g of DI water.
Today I started reading this thread on RC on how to recharge DI resin.
http://www.reefcentral.com/forums/sh...readid=1144161
Although the chemicals are caustic, its commonly sold at hardware stores and are no less caustic as some of the chemicals that we use on our toilets, bathtubs or clothes.
So my topic/question for discussion is primarily targeted at (but not limited to) those who already have an initial low TDS reading:
why don't we all just use DI water instead of the RO and DI?