Review on 🐠 Seachem Replenish 500ml (16.9oz) - Premium Water Supplement for Aquariums by Lori Chantland

This product will bring reverse osmosis water to any desired dH level. Tip: Do not remove the foil under the cap! Instead, grab a needle or X-Acto Blade and just poke a tiny slit in it. So you can dose one drop at a time. This is very effective stuff. You should measure the dH of a gallon of your soft water, then just add a drop of this stuff, stir and measure again. This way you will see how powerful it is. In a small aquarium, you may only need to use one drop with each water change.