Hugely overlooked is the need to regularly calibrate your controller ph probes. I suggest AT LEAST every 6 months. Some folks are calibrating monthly. I was suspicious that my Apex was reading very high and found it was way off. A simple, 10 minute process to calibrate. Tip: always use a small amount poured into a separate container. I fill two shot glasses well rinsed in RO or distilled water to 1/3 full of each solution. I suggest you do the calibration twice to be sure you get consistent readings and follow the sequence in your manual exactly. Be sure to properly dispose of the used solution when done. It has been suggested that it may be toxic and should NOT go into the house drain. Also important, check your total carbonate hardness. It's not the same as Ph and you need a correct carbonate hardness range as well as correct ph range. Check them both regularly. Thank for sharing your solution with me, John.sfboarders said:I've got 2 big bottles of 7 and 10 that will last awhile.
screebo said:Hugely overlooked is the need to regularly calibrate your controller ph probes. I suggest every 6 months. I was suspicious that my Apex was reading very high and found it was way off. A simple, 10 minute process to calibrate. Tip: always use a small amount poured into a separate container. I fill two shot glasses well rinsed in RO or distilled water to 1/3 full of each solution. I suggest you do the calibration twice to be sure you get consistent readings and follow the sequence in your manual exactly. Be sure to dump the used solution when done. Thank for sharing your solution with me, John.sfboarders said:I've got 2 big bottles of 7 and 10 that will last awhile.
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+1GreshamH said:I think they are non toxic but I treat them as toxic. Our lab waste removal takes them away for me. FWIW I do not like dumping much down the drain.