I only wear them for about 5 hours and I can already see the difference! I'm not a big fan of traditional filters so this set was perfect for me. I used stock size for my 20 gallons and small for my 10 gallons. All I had to do was hook it up to the airline and it was ready to go. Be careful when you put them in the water, squeeze them well so they can soak in the water and sink to the bottom.
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