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This mornings reading was .1 ppm at 9am. 12/17/2020
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That’s interesting, I will have to mess around with that and record what I find. I use Alexa to time everything. So when I press the button at the C1 stage my intervals should vary less than 20 seconds between tests each day. I will try extending and shortening that in a couple scenarios. Thanks!This is a very interesting thread. I had someone tell me that corals uptake phosphates at night. I think he said they release some during the day as well. That could explain the swings you're seeing. I wonder what @Randy Holmes-Farley has to say about this!
Also, I have noticed with my hannah ULR that the readings will vary depending on how long the mixture has been in the cuvette.
I was playing around with mine last week, and took 4 readings with the same cuvette. Don't remember the time spread, but it was only a few minutes between all of the tests.
.05, .03, .02, and .00.
Would be interesting to do some more testing and see how much of a difference mixing and "resting" (for lack of a better word) time makes.
This is a very interesting thread. I had someone tell me that corals uptake phosphates at night. I think he said they release some during the day as well. That could explain the swings you're seeing. I wonder what @Randy Holmes-Farley has to say about this!
Also, I have noticed with my hannah ULR that the readings will vary depending on how long the mixture has been in the cuvette.
I was playing around with mine last week, and took 4 readings with the same cuvette. Don't remember the time spread, but it was only a few minutes between all of the tests.
.05, .03, .02, and .00.
Would be interesting to do some more testing and see how much of a difference mixing and "resting" (for lack of a better word) time makes.
I see what look to be two big Mexican turbos. I would guess they are doing their job. I have 15 in a 75 gallon aquarium and they are about two inches in diameter. They eat an 8x8 inch sheet of dry algae in two hours every day.Here a pic of the tank as well to help show the lack of algae.
Yea plus some cerith, Nassarus, a fresh batch of trochus babies, limpets, and maybe 15 various hermits.I see what look to be two big Mexican turbos. I would guess they are doing their job. I have 15 in a 75 gallon aquarium and they are about two inches in diameter. They eat an 8x8 inch sheet of dry algae in two hours every day.
Interested on knowing more about the difference you experienced using rodi vs distilled. I use rodi and thought I was ok. What advantages with distilled?It does make sense that if you test right after feeding (before your tank has had a chance to process the food) you would get oddly high numbers but i'm not too sure, hopefully someone else can chime in and be more helpful
Fwiw rodi (even 0 tds) never touches my curvettes. Distilled only. I learned this while doing thorough research on how to properly use the Cal checker and just carried it over to the other checkers as well.
Steam distilled water is cleaner than rodi and will get you more accurate results. An rodi with all brand new filters should be fine but after it has had some light use the water is not pure enough anymore for the Hanna checkers imo (even if it's 0tds water).Interested on knowing more about the difference you experienced using rodi vs distilled. I use rodi and thought I was ok. What advantages with distilled?
Thanks. Looks like a comparative investigation is on the horizon. Good thing I have solar batteries in my vacation rental. Plenty of distilled laying aroundSteam distilled water is cleaner than rodi and will get you more accurate results. An rodi with all brand new filters should be fine but after it has had some light use the water is not pure enough anymore for the Hanna checkers imo (even if it's 0tds water).
Glad to see I’m not alone!My tank is the same, phosphate before feeding in am is 0.03ish and then later in the day after feeding its between 0.06-0.09.
some days the low reading is 0.05 ish.
I too have wondered how everyone has a stable number.
Interested on knowing more about the difference you experienced using rodi vs distilled. I use rodi and thought I was ok. What advantages with distilled?
Steam distilled water is cleaner than rodi and will get you more accurate results. An rodi with all brand new filters should be fine but after it has had some light use the water is not pure enough anymore for the Hanna checkers imo (even if it's 0tds water).
Thanks for that Randy - I have slowly been transitioning to the Hannah checkers - currently have calcium, alk and phosph - thinking about the PH - calcium checker only one that is "freakishly sensitive"The need for distilled only relates to the calcium checker and its poor design that has it freakishly sensitive to very small levels of calcium in the blank. 0 ppm TDS RO/DI is perfectly adequate in all other Hanna tests, and often is adequate in the calcium one too, depending on how well the RO/DI is really working.
Using distilled water in my Hanna Calcium checker made all the difference. It was way off when I was using RO/DI that must have had about 100ppm of Calcium in it. After reading somewhere (probably on here) that we should use distilled water for this checker, I tried it and it has been very stable ever since. I really dislike the titration test: the vials get fouled very quickly and it seems to be much more effort and time.
so interesting results from a comparative analysis. Calcium with distilled: 476ppm; Calcium with RODI: 454ppm. Would have expected the inverse results given the conversationThe need for distilled only relates to the calcium checker and its poor design that has it freakishly sensitive to very small levels of calcium in the blank. 0 ppm TDS RO/DI is perfectly adequate in all other Hanna tests, and often is adequate in the calcium one too, depending on how well the RO/DI is really working.
No. The problem is that a trace of calcium in the blank leads to a low aquarium reading because it multiplies up the blank to a nonzero value, and then subtracts that nonzero value from the aquarium water.so interesting results from a comparative analysis. Calcium with distilled: 476ppm; Calcium with RODI: 454ppm. Would have expected the inverse results given the conversation
Oh, so when it first calibrated prior to introduction of sample it has already factored in the calcium? Chemistry is what kept me out of the hard sciencesNo. The problem is that a trace of calcium in the blank leads to a low aquarium reading because it multiplies up the blank to a nonzero value, and then subtracts that nonzero value from the aquarium water.
so to add to that line of thinking, I should most definitely switch using RODI in the blank when storing and switch to distilled?Oh, so when it first calibrated prior to introduction of sample it has already factored in the calcium? Chemistry is what kept me out of the hard sciences