Algae is present whenever there is liquid and light.
In hydroponics gardening, where light, water and nutrients are present, algae growth can be a weekly maintenance headache to clean. Algae can be present in soil as well. Wherever light meets moisture.
To prevent or at least reduce algae growth, removing the light element is the easier solution for roots zone.
Large systems gardening used dark opaque colored containers for reservoir for this reason, however when we want to recycle small bottles for rooting purposes or KRATKY hydroponics, there is often no choice in bottles’ colors unless paint is used.
Larger bottles wear socks to shield soil or liquid from light.
Another solution can be found by re-using hard paper rolls to shield clear plastic containers from light, especially for smaller bottles.
No glue needed! All we need are paper rolls and a pair of scissors. Cut a slit along the length of the paper roll.
The height as desired to cover the bottle. Two or more paper rolls may be needed to cover a tall cylinder shaped bottle.
Short paper roll to bracket paper shield in place.
A free of charge, 5 minutes solution to prevent algae growth in small hydroponic bottles and helped our environment!