please provide the information requested in post 7 above, and use English. People here are very willing to help, but it's an English speaking forum.Help me
complete apt3 fertilizer
It is a <"bit strange with ppm TDS">. We actually measure the conductivity (in microS) and this is a measure of all ions (charged particles) in solution. Rather than there being <"an absolute value">, everyone <"will start with a different datum value"> and then you just look for changes. Basically if the TDS value continually rises you need to change more water.How much should the TDS be at?
We've developed <"two different methods for fertiliser management">, that don't rely on water testing.I'm dosing 3 ml a day. I'll run the tests tomorrow.
In addition to what Darrel says above, a good rough guideline to establish a reasonable whereabout of your expected TDS is to add some WC water to a small bucket and add the weekly relative amount of fertilizer and measure the TDS of that. For instance if your tank is 100 L and you change 50 L weekly and add 3 ml of fertilizer per day: Add 5 L of WC water (remineralized RO or tap - whatever you use), add (5/50 * 3 * 7) 2 ml of fertilizer and measure the TDS. Of course this won't account for uptake and unavoidable background waste and fertilizer, but it should give you a pretty good baseline of what your TDS should be around before each water change. If that number comes out at say 150 ppm on your TDS meter, thats what the TDS should be hovering around over time. If you see a gradual uptick (or variation) over time you can be assured that you have a combination of varying tap water TDS (if your using tap), accumulation of fertilizers, decomposed plant/fish/food waste, leaching hardscape/substrate, overfeeding etc. In my own tanks my TDS is rarely outside 10% of my target.How much should the TDS be at?