if the entire jar is measured out for a 900ml solution container, and then distilled water is added. otherwise it's pointless to do that IMO.
I see your point, but the one Gentleman was trying to save himself from having to drag out all the dry mix and digital scan to measure every time he made a new batch. He wanted to make a pre-mixed batch and simply dip out of that each new batch.Sure you can do it but I don't see the point. Let's say I have a 100 gallon aquarium so I take 2 litre Coke bottle and make PPS-Pro solution. How long is this going to last? Over six months. After six months I can make another batch, why not?
For dosing my dry ferts I use the little plastic containers for hot sauce from my neighborhood taco shop. Just rinse very well in hot water, dry, measure out my doses of macro/micro. Then when it comes time to add to tank, just open, swish in a plastic container of tank water and add to tank. Easiest method I've found so far....I was reading this post and having just come back from taco bell and the thought of a ketchup packet came to mind. Can you think of some sort of reusable or disposable container or packet that you could put all the precisly pre-measure a amounts to make a 900ml.
Then when you wanted to make a new 900ml container, simple open a ketchup packet (So-to-Speak) and make your new batch.
I hate to relate it to this, but it is my understanding that headshops (Bazzar Bazzar, Hot Topics, etc.) sell those little gram ziplock baggies that drug dealers use very cheap. I wanna say like 4 bucks for 100. You could pre-measure about 20 baggies and throw the baggies in your mason jar and each time you make a new mix just dump in one baggie.