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The actual biological balls are way smaller than it appears in the pics. May be a good quality, not sure. I have been using those for a month now for my DIY sump. Still don't see a colour change or anything, so can't guarantee if these balls can actually be a good home for healthy/ beneficial bacterias.
Verified purchase: Yes | Condition: New
Quantity for the money is poor and the media does not work at all well
Verified purchase: Yes | Condition: New