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Thread: API Master Test Kits
11-16-2012, 09:28 PM #1
API Master Test Kits
Query, have any of you had any problems with these test kits? Following the instructions to the letter, I constantly show 5+ ppm of nitrites, even after a 50 % water-change. I'm beginning to wonder about this.
11-16-2012, 09:37 PM #2
Have you tested your tap water?
11-16-2012, 09:52 PM #3
Yeah, test your tap water. I always recommend that so you know what you are dealing with before the water goes into the tank.><((((º> ><((((º> ><((((º> ><((((º>
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11-16-2012, 10:47 PM #4
Ph-7.5, Amm-0 ppm, Nitrites-0 ppm, Nitrates-.5 ppm. My tap water.
Last edited by Dave Waits; 11-16-2012 at 10:50 PM.
11-16-2012, 10:54 PM #5
Well that should show that your test kit works if you get a different reading from the tap. Do another 50% water change and immediately test again?
11-16-2012, 11:14 PM #6
A 50% water change will not make a big change if you really have 8 ppm nitrites and they now drop to 4 ppm - both could, on a kit, read about 5 ppm since the eye is not great at comparing colors since light type and intensity matters.
Do a real water change - 90%+ because nitrites should be well under 0.5 ppm or lower. That is a better test. I hope this isn't an aquarium with fish ... .
11-16-2012, 11:16 PM #7
+1 to Cermet. if you have to do multiple water changes to equal that 90 percent do so. I've had to do two fifty percent water changes at one time to get some of my NitrItes down. they were 3.0 at one point.
20 gallon tall -7 paskai's rainbowfish (neons and blue eyes), 8 rasbora het, 2 blue ninja shrimp, 9 cherry shrimp, 3 algae eating shrimp, 2 nerite snail, 2 pc driftwood planted with anubias and narrowleaf java fern.
Other plants in tank - 1 bunch anacharis (separated), 1 bunch water wysteria (separated), 1 red wendii, Mossball, 1 microsword plant (separated), 1 package of staurogyne repense (separated)
Cinnamon = 9 year old Siamese Cat[
1 Rat - Domino aka Domi
1 Robo hamster - Spice
11-16-2012, 11:20 PM #8
You aren't testing immediately after the w/c are you?
Anyway, do the math. If your nitrites are 20ppm to start, and you do 1 50% water change, that lowers it to 10ppm. Once more lowers it to 5ppm, once more to 2.5ppm etc.
You may need to do multiple w/c's.
11-16-2012, 11:28 PM #9
I wait an hour after the water change to test, so far I've changed 150% of the water in three days. Still deep purple. Color tint never changes. Based on the theory that a 50% change drops the reading in half, I should have seen at least a small difference, I haven't.
Last edited by Dave Waits; 11-16-2012 at 11:31 PM.
11-17-2012, 12:03 AM #10
As an experiment, take a store bought water bottle and test the water in it. If it gives a weird result there is a good chance your test kit may be messed up or expired.
Here is how to check the bottle to see if it is expired.
Each reagent bottle has a Lot # printed
on the bottle. The last four digits are the month and year of
manufacture. Example: Lot # 28A0102. This is a pH reagent manufactured
in January of 2002. Pond Care Wide Range pH, ammonia, High Range pH,
Nitrate, phosphate, Copper, calcium and GH all last for three years.
nitrite and KH will last for four years. Freshwater pH(low range) and
Pond Care Salt Level will last for five years. I would not trust these
kits after they have expired.
Info was found on