I just talked to my friend David who owns Golds aquarium in Calgary why my geo tank's ph is not settling after such a long time is cuz the sand is not stirred up and it will keep buffering cuz once the top layer of sand gets stirred then the sand under it will rebuffer it. Basically he saying the top layer of sand will lose it's buffering capacity but the sand under it won't unless I keep stirring it up consistently then it will eventually lose all it's buffering capacity.
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first off your friend david doesnt own gold aquarium
i give up with you
and if somebody told you that at golds lol what is the sand underneath still dry??? geos consistanly stir up the sand plus the sand is completely submerged.i dont think sand will rasie ph. not by 1 hole point 6 months later. your not testing correcly
if you used a tds meter test the tanks water get a reading than stir up your sand one second after and take a second tds reading when your tanks all cloudy you will get a higher reading. also if your letting that tank evaporate that will make your tds raise. also your probably adding salt.that will raise the hardness too. another your mechanical filteration sounds like its lacking this will create a higher reading.