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#1
12-30-2014, 08:18 PM
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maybe the hanna checker isnt reading accurately?
how old is the powder?
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250G DD LED SPS R.I.P. 180G LED SPS 80"x36". 300G custom build Owner of Mountain Ridge Heating and Gas Class A gas fitter, HVAC 
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#2
12-30-2014, 08:36 PM
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I use that hanna checker weekly on two tanks. Reagent box I'm on had an expiry date of 2016.
I did get a box of reagent that would only give out 0.00 readings but both tanks have been in the .12 to .08 range since summer so I'm pretty confident with the readings.
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#3
12-30-2014, 08:41 PM
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Sample water taken before the RO, after the RO and before the DI and after the DI. This will tell you where the problem is in the RODI system if indeed it is a problem in that system, it just means disconnecting a couple of places temporarily for the samples.
Best done after the RODI is running for about a half hour or more. I'd still be checking the phosphates with another test kit.
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#4
01-03-2015, 03:24 AM
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Straight tap water - 0.16ppm
After filter and carbon filter - 0.19ppm After RO membrane - 0.13ppm After DI Resin - 0.13ppm Rejected water from RO membrane - 0.25ppm These results would be believable if filters were old and resin was spent but all are new. Went to another reefers house today and did some testing. His Salifert PO4 test kit read 0.00ppm on his clean RODI water, my hanna tester read 0.16ppm. OK, now that I don't trust my meter I came home, opened a new box of reagent and tested tap water for kicks... 0.00pm What other test kits do people use(and recommend) for PO4?
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#7
01-03-2015, 04:14 AM
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Can't help with a recommended test kit as I've not tested for phosphates in about 20 yrs now. I tested when I first started the hobby but then realized that I was ALWAYS adding phosphates every time I feed the tank with anything so why bother.
I didn't have to test to know I had a problem as I could see the changes in the tanks. If my husbandry protocol wasn't sufficient for the various maladies that could arise, I changed my protocol to what would be sufficient.
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