KH is 8 in Filtered Water. Is this ok?

[LeanneP]

I use an aquarium filter that I bought at J & L to filter my water and the KH is 8 after filtering it. Is this ok? When I mixed my last batch of water I had KH at 15 again. I did roll the bucket, but just wondering if that is contributing to my high KH.

Leanne P

[Cal_stir]

If it's a RODI unit, I think your test kit is wrong.

[LeanneP]

No, it is not a R/O unit. It is a cartridge filter.

Leanne

[Cal_stir]

Still sounds too high, seems that you guys have pretty good water out west, I don't think your tap water would be that high KH even unfiltered.
Try a different test kit.

[425nm]

Is this cartridge filter a carbon filter? If it doesn't have a deionization resin it probably won't affect hardness.
Is that water hardness reading the same as your unfiltered tap water?

[LeanneP]

I have just checked my tap water and it is at 7 and the filtered water is at 8 so I guess the filter is affecting the hardness some. It doesn't say what kind of filter it is, just that it takes out minerals, heavy metals, contaminants, chlorine etc. It is for aquariums specifically so I would hope it wouldn't screw up the water. I just thought I read somewhere that R/O water had 0 for KH so I was wondering if that was making my KH higher since it was already at 8 when I added salt to it.
Leanne P

Originally Posted by 425nm

Is this cartridge filter a carbon filter? If it doesn't have a deionization resin it probably won't affect hardness.
Is that water hardness reading the same as your unfiltered tap water?