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One day we will have it. One of the issues is the levels we are trying to maintain in a reef tank are so low. As of now the hanna ulr phosphorus checker is about as good as it gets. To make that automated, I'm sure is possible. To do it well, being very accurate to ppb levels, and for a reasonable price may be the challenge. I would personally rather have a phosphate monitor over magnesium and probably over calcium as well. As one said here on R2R, alkalinity monitoring was the holy grail, but phosphate monitoring would be a nice icing on the cake!
Hi ZaneTer,Personally I would monitor calcium and magnesium daily but only if you are dosing. This can help you detect a failure in your dosing system whether it is under or over delivering. I am tempted to buy a second hand Hanna ULR PO4 meter and hack it to be automated. In the end the cost will probably come to around $200 in my case but I have a custom controller so the costs are relatively low. Reagent costs are reasonable so I am not too worried. Coupled to a PID loop and an accurate doser( to 1/100th of ml, this can even be done with a $5 dosing head controlled by a PLC operating at <1ms) you should be able to achieve near perfect PO4 stability. Additions can be done by dosing pump and subtractions by increasing the lighting schedule on a fuge or by dynamically dosing vinegar.
Oop so sorry I never follow up.Do you have WeChat?