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Green water. Murky mess. It is heartbreaking, right? You build this stunning pond, choose gorgeous koi, and then pea soup. Oh! Do not panic. You do not need a chemistry degree. Just the right filter. That is it. One good decision saves month of swearing at green sludge. Trust me.
Let me tell you about the Evolution Aqua Nexus 320. Absolute beast of a filter. That Pond Guy – honestly, they are brilliant – stocks this kit. I once called them with a stupid question about pipe sizes. They did not laugh. Well, maybe a little. But they helped. The Nexus 320 handles solids and biology in one unit. No messing. Want crystal water without scrubbing sponges every weekend? That Pond Guy will point you right.
So, what is ruining your pond?
Three things. Fish waste. Uneaten food. Algae blooms. Koi are greedy little buggers – they eat loads, and what goes in must come out. That waste becomes ammonia. Ammonia stresses fish. Stressed fish get sick. Sick fish break your heart.
You need filtration that covers:
- Mechanical – catches visible gunk. Leaves. Poo. Stray pellets.
- Biological – grows good bacteria that eat ammonia and nitrites.
- Circulation – keeps water moving. No stagnant, smelly zones.
Why the Nexus 320 actually works
It is gravity-fed. Drum and K1 media. Sounds fancy. It is not. Waste water enters from a bottom drain. The drum catches solids. Then the K1 media – those little plastic bio chips – gives bacteria a massive surface area to live on.
Good stuff:
- Self-cleaning drum – no wrestling dirty pads
- Huge bio capacity – handles heavy fish loads
- Built-in aeration – bacteria love oxygen
- Less maintenance than you think
I have seen ponds with the Nexus 320 that look like bottled water. No joke.
Mistakes I have made so you don’t have to
First, I under-filtered. Bought a cheap canister. Water went green in a month. Annoying.
Second, flow rate. Your pump and filter must match. Turn your pond volume over every two hours – that is the golden rule. Too weak? Waste sits. Too strong? Stressed fish.
Third – and this hurt – I rinsed biological media in tap water. Killed all the good bacteria. Disaster. Always use pond water. Always.
UV and maintenance stuff
The Nexus 320 does not include UV. You add one inline. Green water algae? UV zaps it. Get a 55-watt for a decent pond. Check the drum screen weekly. Clean K1 every few months – but only one chamber at a time so bacteria survive. Replace UV bulbs every season (they fade even if they still glow). That Pond Guy sells spares. Handy when you lose that one little screw. Clean water. Happy koi. Worth it.
Conclusion
So, there you go. Clean water is not magic. It comes down to three things: the Evolution Aqua Nexus 320 from That Pond Guy, a dash of patience, and learning from my stupid mistakes.
Check the drum weekly. Do not rinse bio media in tap water. Replace UV bulbs every season. Your koi will thrive. You will actually enjoy sitting by the pond instead of cursing at green sludge. Worth every penny.
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