Someone explain me some math..

[don.ald]

1 drop of c = 50. so when you get to say 400 and the colour has not changed switch to D. +10
so 8 drops of c = 400 then add on drop of d and if it changes then your ca is 410. if it takes 2 drops of d to change colour then its 420, and so on.

[lastlight]

Originally Posted by don.ald

1 drop of c = 50. so when you get to say 400 and the colour has not changed switch to D. +10
so 8 drops of c = 400 then add on drop of d and if it changes then your ca is 410. if it takes 2 drops of d to change colour then its 420, and so on.

+1

I usually add 7 drops of C (350) and then switch to D so as to not over-shoot the mark. If all goes well I add 7 drops C (350) + 7 drops D (70) = 420

[Aquattro]

Originally Posted by lastlight

+1

Well ya, I got that figured out in all of about a second, but should I be using a test kit where they can't even get the directions right? This isn't a translation problem, pretty sure math is math, even in German. What other QC are they sloppy on?

[lastlight]

Originally Posted by Aquattro

Well ya, I got that figured out in all of about a second, but should I be using a test kit where they can't even get the directions right? This isn't a translation problem, pretty sure math is math, even in German. What other QC are they sloppy on?

You must have an uber rare ltd edition misprint ! My instructions (kit is only a couple months old) are correct as was my last one.

[don.ald]

just use API much easier and accurate enough. and when it's not and you get Pi$$ed it is cheaper when you pitch it out the window

[Borderjumper]

Originally Posted by don.ald

just use API much easier and accurate enough. and when it's not and you get Pi$$ed it is cheaper when you pitch it out the window

Or give it to Jake

[Aquattro]

Originally Posted by Borderjumper

Or give it to Jake

Jake's got enough lately

The kit is easy enough to use, although my test showed Ca at 450, which is higher than I would have expected. Salifert generally gives me about 420.

[don.ald]

ok now you have to mix a batch of salt and test!

[Aquattro]

Originally Posted by don.ald

ok now you have to mix a batch of salt and test!

I'm not exactly sure what my salt is supposed to be, so that won't help

[Delphinus]

Maybe we should be checking to see if the instructions have an expiry date not just the reagents? Geeeze.

I can't say I noticed the bad math example before on the instructions but it's been a long time since I looked at Elos Ca test kit instructions in detail. The last kit I had was also consistently giving me bad readings of .. interestingly enough I think it was always 450 as well. I can't remember for sure I'd have to check my notes but I stopped using the Elos Ca test kit. I like the Salifert best. I did pony up for a Ca checker from Hanna but it has its own issues (basically you test 0.1ml of tank water which you have to add 0.9ml of lab grade distilled water (doesn't everybody have this? I carry some in my wallet just in case because you just never know when you're going to need some lab grade distilled water) and when you're doing a test on such a tiny sample it just has to be prone to fluctuating readings, I would think .. esp if you cheap out and just use "regular old vanilla RO/DI" instead of "lab grade distilled water.")