How do you filter aquarium water without electricity?

Add bottom dweller fish that will eat all the leftover food that will otherwise rot & release ammonia. As well as, it is important to add algae eater fish that will scrape off the algae from the aquarium glass, ornaments etc.

It should be noted that these choices are not as efficient as electric filters, so aquarists must be vigilant about maintenance of the aquarium.

It is important to balance the number of live plants with the number of fish you are keeping in the aquarium. When you achieve the right balance, you will be successful in wiping out CO2 from the water & will have plenty of oxygen for the fish. Adding heaps of plants will ensure you have clean water with plenty of oxygen for the fish.

The growing bed is perhaps the top place to start when setting up a planted aquarium for fish. Usually a 1:1 or 2:1 (growing bed to aquarium volume) ratio is used based on the setup.

If you want to setup a power-less filter for your aquarium, then you need to keep an eye on the water quality, & spend more time & effort to maintain your aquarium.