Do not use with permanganate or chlorite-based treatments. For total ammonia testing, use only salicylate-based (indole-phenol) tests; Nessler's ammonia test kits will give false, high (or off-scale) readings. For dissolved oxygen testing, use only indigo-carmine tests or DO meters; Winkler dissolved oxygen tests will give false, low or zero readings.
Each ounce treats up to 90 gallons.
Note: All prices in US Dollars