Whos running a CaRx

whos using a CArx

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    36
sunburst said:
DATE TIME TEMP pH REDOX
1784 2007/11/07 0036 25.1 8.09 535.00
1785 2007/11/07 0136 25.4 8.04 541.00
1786 2007/11/07 0236 25.5 8.00 546.00
1787 2007/11/07 0336 25.2 7.97 544.00
1788 2007/11/07 0436 24.8 7.94 546.00
1789 2007/11/07 0536 24.8 7.90 550.00
1790 2007/11/07 0636 25 7.87 559.00
1791 2007/11/07 0736 25.3 7.85 564.00
1792 2007/11/07 0836 25.5 7.82 566.00
1793 2007/11/07 0936 25.3 7.81 562.00
1794 2007/11/07 1036 25 7.82 559.00
1795 2007/11/07 1136 24.7 7.94 548.00
1796 2007/11/07 1236 24.5 7.95 554.00
1797 2007/11/07 1336 24.7 7.96 554.00
1798 2007/11/07 1436 25 8.05 549.00
1799 2007/11/07 1536 25.1 8.00 543.00
1800 2007/11/07 1636 25.2 8.02 539.00
1801 2007/11/07 1736 25.2 8.04 538.00
1802 2007/11/07 1836 25.2 8.05 545.00
1803 2007/11/07 1936 25.2 8.05 547.00


My tank readings from 1:00am this morning....the period where pH drops the quickest.
Sorry about formatting...will not allow spreadsheet pasting
Click to expand...
Sean,did you manually keep track of this or are you running some program to keep track of it?
 
The pH drop in the middle of the day is quite interesting. I was under the impression that pH slowly rises throughout the day and drops off again after dark.
 
The redox is fairly high, are you running Ozone? I always thought redox should be around the 400-450 mark?
 
irie ivan said:
The pH drop in the middle of the day is quite interesting. I was under the impression that pH slowly rises throughout the day and drops off again after dark.
Click to expand...

You right...hadn't noticed...drop by .05 and then rose again...what would cause that? I have being stepping up my kalk saturation....maybe a dose could have caused the slight spike and then drop.

Mek tank connected to pc. Can show pH fluctuations hourly, daily etc The best toy i have ever owned. Can also present info in graph form.
 
Alan said:
The redox is fairly high, are you running Ozone? I always thought redox should be around the 400-450 mark?
Click to expand...

I also thought so... but have calibrated and re calibrated and still same reading.After water change levels drop right down to 420 and 2 days after water change breaks 500.

I did a water change on Saturday, limme see if i can copy and paste to show you what i mean. Also with all the load shedding we have had my redox dropped to 280 the one afternoon. See if i can find that. I have been thinking of switching off three of the 4 pumps on the skimmer and see what happens.
 
Look up IKS Aqua star. From Reef Inmates.
Just checked; Redox only dropped to 480 on Saturday after water change.
Alan, is a Redox this high a reason for concern
 
Hell, for the life of me i cant recall the exact figures, i did some research a while ago and seem to remember too high is not too healthy.......will have to go back and read up again.
 
sunburst said:
I also thought so... but have calibrated and re calibrated and still same reading.After water change levels drop right down to 420 and 2 days after water change breaks 500.
Click to expand...
Achieving 500+ redox without adding ozone or some other oxidiser (e.g. hydrogen peroxide...) is highly unlikely.
  • How long have you had this electrode in your tank? New ORP electrodes don't give accurate readings, and can take up to a month before they become stable and accurate.
  • Stray electricity in the tank (induced by pumps, lights, and 101 other things...) could "bias" the readings. I have personally had this problem, and eventually found that it was caused by two high-class pumps, an Eheim 1260 and a Tunze powerhead, both of which were permanently switched on. Sudden "spikes" in the ORP and pH could also be caused by other electrical equipment (especially MH's...) switching on or off.
If you can remove the electrode from the tank, place it in a glass beaker with tank water, away from the tank, pumps, lights, etc, and check the reading after a few minutes - if it is different from the "in-tank" reading, you have found your problem...
​
  • If the electrode is exposed to light, and if it has been in the tank for some time, a high ORP readings could also be caused by algae growth on the electrode producing a high local oxygen level - the electrode should preferably be installed in a "T" fitting in a pipe such as a return- or closed loop pipe which has a constant water flow.
HTH

Hennie
 
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