FREE Sample Of Compost Tea Catalyst Complete the online form below to receive your FREE Compost Tea Catalyst 10 Gallon Sample Pack. The resealable package has enough Catalyst for one 10 gallon batch of Compost Tea or two five gallon batches. Use the convenient measuring spoon included to add the proper amount. A special savings coupon will be included for your next Compost Tea Catalyst or Compost Tea System10 purchase. Offer limited to U.S. addresses only. One sample per customer.