Hello again, since there seems to be no obvious flaw in this experiment, i started preparing it.
So i want to test those hypothesis :
H1 - Seiyru stone impacts GH;
H2 - Seiyru stone impacts KH;
H3 - Seiyru stone impacts PH;
H4 - Seiyru stone impacts TDS/EC;
H5 - Seiyru stone impacts NO2;
H6 - Seiyru stone impacts NO3.
I believe that H1,H2,H3 and H4 are true, while H5 and H6 are false.
I'll try to prove or disprove theese hypotesis first (it should be quick).
Once this is done, we'll get as many data points to try to measure how much it impacts those parameters.
So now, let's prepare the experiment. For this, i took 3 identical plastic containers (only color changes), and filled them with 10L of tapwater each.
Then i took 3 seiyru stones, whose volumes and masses i measured :
Rock R1 is 1000ml in volume, 2522g in mass.
Rock R2 is 750ml in volume, 2228g in mass.
Rock R3 is 500ml in volume, 1403g in mass.
Sadly, i have no easy way of measuring the rock surface area, so i can't provide this data.
All 3 rocks have been used in the same aquarium for 2-3 years, but have been dry for 2 months (so no living critters left, normally).
is composed of two glass jars, each containing 200 ml of the same water as the larger containers; they won't recieve any rock.
All containers are in the same spot, in an air conditionned room (it runs all the time), and water have been gathered at the same time for all 5 containers, from the tap of my fishroom.
I'm letting the water in the containers for this night with nothing in it, and will start the experiment tomorrow monrning by introducing the rocks in the containers. I'm starting it tomorrow to have more data points in the early stages (just in case it changes quicker at start, rather than a linear progresion).
I'll keep you posted tomorrow, with the starting parameters.
For french readers, i wrote a more detailed article here on the experimental protocol (french)