Does Seiryu stone increase TDS and hardness?
I have come across something weird. My tank TDS was 300 and then I did a 70% water change with just pure RO which was 2 TDS. Came back a couple of hours after the water change to check my TDS and it was 260. There is no way on earth that water that's 70% 2 TDS and 30% 300 TDS = 260. This doesn't happen on my other tank with Dragon Stone. Is the Seiryu the culprit? The tank has a ton of it.