Yellow Water

[mbar]

I am thinking that something you used may have had some chlorine in it, and gave you a little of the lime-ade coloring you get when you put chlorine in a baquacil or non chlorine pool. As the chlorine goes away, the color probably will too. Just a thought.

[waterbear]

It was my understanding that E-Z Pool/Chlor-Free is not biguinide but some sort of propiretary mixture (I would guess sodium percarbonate as the main ingredient since it's level can be tested with DPD) that is supposed to eliminate the need for chorine. I don;'t believe it is EPA approved.
http://www.americasbestpoolsupply.co...1/PageNumber/1
http://www.ordinis.com/chemistry/e-z_pool.htm
http://www.rogerspools.com/chemical.htm
There is also an ionizer called Chlor-free.
http://www.chlorfreeglobal.com/how_works.php
http://www.chlorfreeglobal.com/product.php
In either case I would have the water tested for metals. I would also recommend switching to chlorine.

[mbar]

Wow, I didn't know what it was! Sounds like it is a mineral based product - which could lead to stains. Thanks waterbear!