How do you mean? I think it was running approximately six hours because I forgot it was still set on manual, so was probably a bit strong. I tested it with a TDS meter and it was about 26ppm and then it was about 14ppm after a couple of days. dee

On 23 Sep 2009, at 12:20, Ode Coyote wrote:



 You didn't test the timing in a sample first.

Ode



At 05:41 PM 9/22/2009 +0100, you wrote:
I've made some EIS which is approximately 14ppm and left it two days
and then put in 4 drops of H202 3% and it has immediately gone a murky
greeny grey!  The amount was 500mls and I have done it before,
although only using three drops.  Can anyone tell me what could have
happened?  Thanks.  dee


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