Don't get hung up on the absolute TDS number, worry about the delta between whatever your source water reads with added ferts and micros and the tank reading. This will indicate a build up of solids and tell you that a water change is due.
Any mineral additive will increase TDS, that is what they are. If you add that many minerals in your water change water, without top off with RO, you may be increasing the TDS without realizing it.
If you are happy with the Seachem products, use their acid and alkaline buffers together to target a specific ph and record that TDS reading as your "water change" TDS. Then calculate the TDS for the Seachem fert program you are dosing and add that "dosing" TDS to the water change TDS to get a benchmark. Then all you need to do is add a multiple of the dosing TDS to the benchmark and that number is the tank target you want to stay below, in order to avoid an excess of nutrients. That margin could be more or could be less depending on other factors, so you can experiment with the margin. PPS pro starts at 1x dosing TDS increment beyond the water source which indicates that the daily dose is greater than the daily uptake by plants so the TDS rises above the benchmark. For example, if the daily dosing adds 50ppm to the water change TDS of 200ppm, your benchmark is 250ppm. So 2x the nutrients would be 300ppm, 3x would be 350ppm etc etc.
PPS-pro is much easier to maintain as the numbers have been worked out by Edward, but you can call Seachem and ask them how to determine dosing PPM by adding a specific amount of whatever nutrients you are using to a specific volume of water.
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