Nothing here is label direction — the label is the law. These are notes from other applicators, moderated before they appear. Check the labeling accompanying the product and applicable state requirements.
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PAK 27 is an algaecide formulated with 85.0% Sodium Carbonate Peroxyhydrate. It is a copper-free formulation, making it safe for use in treatment area ponds containing koi. This product is designed to prevent and control various types of algae, including planktonic 'pea-soup' algae. It can be applied as a broadcast or spray-dissolved solution directly over infested areas. For small size water bodies, application rates vary based on pond size and the type of algae infestation (heavy growth vs. maintenance dose). For example, in a 1,000-gallon pond, the rate for heavy planktonic algae is 9 TBSP, while maintenance is 2 TBSP. Users should apply early in the morning or during water circulation. Note that excessive decaying algae can deplete dissolved oxygen, potentially leading to fish kill; if treating large ponds or heavy growth, apply 1/3 of the dose and wait 2-3 days before applying the remainder. The product is corrosive and can cause eye and skin burns. Avoid breathing dust. Always check pH levels before application, as the product can raise pH. Do not mix with aquatic herbicides or algaecides containing copper or bromides. Use caution when applying near birds, as undissolved particles may be corrosive to beaks.
| Target pest | Location | Rate | Unit | Dilution | Label notes |
|---|---|---|---|---|---|
| algae | Outdoor | varies by pond size and algae type | tsp, TBSP, or pounds | can be broadcast or spray dissolved | Apply early in the morning or during circulation. For heavy growth, consider split applications to prevent oxygen depletion. |
| For pests | Location | Amount | Per | Label notes |
|---|---|---|---|---|
| planktonic [pea-soup] algae (heavy growth) | ponds | 1.25 | tsp | for 50 gallons |
| planktonic [pea-soup] algae (heavy growth) | ponds | 2.5 | tsp | for 100 gallons |
| planktonic [pea-soup] algae (heavy growth) | ponds | 4 | TBSP | for 500 gallons |
| planktonic [pea-soup] algae (heavy growth) | ponds | 9 | TBSP | for 1,000 gallons |
| planktonic [pea-soup] algae (heavy growth) | ponds | 3 | pounds | for 10,000 gallons |
| planktonic [pea-soup] algae (maintenance dose) | ponds | 0.25 | tsp | for 50 gallons |
| planktonic [pea-soup] algae (maintenance dose) | ponds | 0.50 | tsp | for 100 gallons |
| planktonic [pea-soup] algae (maintenance dose) | ponds | 1 | TBSP | for 500 gallons |
| planktonic [pea-soup] algae (maintenance dose) | ponds | 2 | TBSP | for 1,000 gallons |
| planktonic [pea-soup] algae (maintenance dose) | ponds | 0.75 | pound | for 10,000 gallons |