Tap water is a chemical circus. Cities add chlorine, chloramines, and sometimes secret ingredients that make your aquarium look like a crime scene. Your fish don’t want to swim in a swimming pool for humans—they want pristine, ancient-rainwater vibes.
Reverse osmosis removes up to 99% of contaminants. That includes heavy metals, pesticides, and even that trace of last week’s coffee you rinsed down the sink. Your fish will be so happy, they might start wearing tiny monocles and complaining about organic shrimp prices.
The "Zero" Problem (Surprise!)
Here’s the hilarious catch: pure RO water is too clean. It’s like giving your fish a lifelong bath in distilled silence. No minerals means unstable pH and zero buffering capacity. If you add RO water straight to a tank, your fish would look at you like you just served them a glass of nothing.
So you remineralize it. It’s like making instant soup—add a packet, stir, and boom: perfect Amazon river water. Many pro aquarists mix RO water with tap water at a 50/50 ratio. That’s the sweet spot where your fish get the purity without the existential crisis.
