Betta Pond Algae Block
When placed into the pond this Algae Block slowly dissolves, releasing di-methyl urea into the pond waters. Whilst totally harmless to fish and healthy pond plants, this inhibits the growth of water-born algae. Prevention is always better than cure, so the introduction of this item in early Spring will prevent build-up of algae as the weather warms.
Product Specifications
| Feature | Detail |
|---|---|
| Active Ingredient | Di-methyl urea |
| Form | Algae control block |
| Usage | Place directly into pond water |
| Effect | Slows algae growth |
| Safe For | Fish and healthy pond plants |
FAQ
How long does it take for the Algae Block to start working?
The block begins to dissolve slowly and starts releasing di-methyl urea into the water over several weeks. Visible algae reduction may be noticed within 2 to 4 weeks after placement.
Can I use this block in a pond with fish?
Yes, the product is safe for fish and healthy pond plants.
How often should I replace the Algae Block?
Replace the block when it has fully dissolved, typically after 4 to 6 weeks depending on pond size and algae activity.

Michael May –
I added the Algae Block in early spring and noticed much less algae growth during the summer. My fish and plants stayed healthy. It’s simple to use and works well without any side effects.
Alexandra Hunter –
The block dissolves slowly and keeps the water clear. I didn’t have to clean the pond as much. Works best when placed early in the season.
Faith Skinner –
Great product for preventing algae. No harm to fish or plants. I’ve used it for two seasons now and it’s reliable.