where to buy 4dKH drop checker solution
do any of the LFS on Oahu sell 4dKH solution? aquascapes said they don't. ironically they sell the red sea drop checker which comes only with pH regent. not very useful without the 4dKH... idk if the ADA drop checker they carry comes with solution but $50 for a piece of glass is stupid.
so yea. anyone found it locally or just order online? thanks