Agar Medium S (R2A Agar) (DM574E) is recommended for heterotrophic plate count of treated potable water using longer incubation periods, in compliance with EP.
| Ingredients | Gms / Liter |
| Casein hydrolysate | 0.50 |
| Yeast extract | 0.50 |
| Proteose peptone | 0.50 |
| Glucose | 0.50 |
| Starch | 0.50 |
| Dipotassium hydrogen phosphate | 0.30 |
| Magnesium sulphate anhydrous | 0.024 |
| Sodium pyruvate | 0.30 |
| Agar | 15.00 |
| Final pH: 7.2 ± 0.2 at 25°C | |
| Formula may be adjusted and/or supplemented as required to meet performance specifications | |
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