had to make this for a friend so I figured I would post it here in case it can be of any help to any of the members.
This excel worksheet will calculate exactly the amount of nutrients needed to bring your resevoir to a target ppm, including adding water. This calculator assumes RO water...
For example, if you have a DWC bucket which you fill with 3.5 gals at 1400ppm, and you come back and there are only 2 gallons left and the ppms are reading 1000, this calculator will tell you exactly how much micro and bloom to add to your top off water (1.5 gallons in this case) to get the res back to your target TDS. It will also calculate lowering TDS. Say your res is down to 2 gallons and the ppms rose to 1600, now you want to bring them back down to 1300, this will accomplish that.
One thing to note, if you are trying to reduce the strength of your nutrient solution and the calculator gives negative values for the amount of micro and bloom, that means that you have to dump some of the res in order to get back down to that low ppm.
http://docs.google.com/fileview?id=...2ItNDZjZi00NTQzLTk4YjktN2ZmMmVlZTJjMjFl&hl=enhttp://rapidshare.com/files/351626704/ADDBACK_CALC.xlsx.html
Update: Calculator will now account for tap water. just enter your tap water ppm and it will adjust the mix for you.
Let me know if this is helpful
__________________
This excel worksheet will calculate exactly the amount of nutrients needed to bring your resevoir to a target ppm, including adding water. This calculator assumes RO water...
For example, if you have a DWC bucket which you fill with 3.5 gals at 1400ppm, and you come back and there are only 2 gallons left and the ppms are reading 1000, this calculator will tell you exactly how much micro and bloom to add to your top off water (1.5 gallons in this case) to get the res back to your target TDS. It will also calculate lowering TDS. Say your res is down to 2 gallons and the ppms rose to 1600, now you want to bring them back down to 1300, this will accomplish that.
One thing to note, if you are trying to reduce the strength of your nutrient solution and the calculator gives negative values for the amount of micro and bloom, that means that you have to dump some of the res in order to get back down to that low ppm.
http://docs.google.com/fileview?id=...2ItNDZjZi00NTQzLTk4YjktN2ZmMmVlZTJjMjFl&hl=enhttp://rapidshare.com/files/351626704/ADDBACK_CALC.xlsx.html
Update: Calculator will now account for tap water. just enter your tap water ppm and it will adjust the mix for you.
Let me know if this is helpful
__________________