I bought these after a totally useless C02 tablet that did nothing. And now. The stone turned green. However, one tab actually turned a little green, I thought I was crazy or it was the light. However after adding 2 more to the filter after 2 hours and 40 minutes I checked again and it was clearly green. and plants. So 3 every day or every other day for me not worth messing around with C02 DIY or the problem of exploding tanks for me yes. It's cheap even at 3 a day and I'm happy to pay them a month if I have to. I'm really amazed at how well this works.
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