My tap water hardness is at normal range 75 to 100 GH mg/L.
For my substrate, I use this Aquarium Gravel and this soil (the fluval soil I just added a few days ago, but the ph has always been low), also have 4 small driftwoods. For the filter I have a sponge, ceramics, charcoal, a filtration resin, and just added the water softener pillow. Based on the product descriptions, I don't find any that said will increase the hardness. I also have planted plants.
Do you have any idea what might cause the hardness level up?
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