Standard Dosage
Use 10 drops per gallon, or 1 teaspoon (approximately 5 ml) per 10 gallons of water, or 4 ounces for 240 gallons of water. This standard dosage produces a concentration of 15 ppm (= 15 mgL) formalin and 0.05 ppm of malachite green. NovAqua+® and AmQuel+® are recommended.

Suggested Treatment Procedures
The following procedures are suggested for both freshwater and saltwater systems. It is important to note that activated carbon will remove the malachite green component of the formulation. Formalin can also be removed somewhat. However, the amount is insignificant.

Treatment of Freshwater and Saltwater External Single-Celled Parasites
The following procedures are applicable when treating the diseased fishes in their original aquarium or pond:
(a) Remove any invertebrates you wish to save.
(b) Remove carbon and clean filter. Replace with clean mechanical filter media, such as Kordon's Bio·Mech ® , and return to use without the carbon.
(c) Perform a partial water change of at least 20-25%. Repeat water changes at 20-25% before each re-treatment with Rid·Ich+.
(d) Calculate the actual volume of water to be treated, taking into consideration the displacement of water by gravel, rock, and ornaments. (To calculate the aquarium's capacity measure its length, height and width in inches, multiply these dimensions together and divide the result by 232. Your answer will be the amount of water in gallons. To calculate the volume of a pond, put "calculate pond volume" in your search box on your computer, and you will get a choice of web sites to go to for this calculation.)
(e) Add a standard dose, such as 1 teaspoon of Rid·Ich+ per 10 gallons of water. This produces a concentration of 15 ppm of formalin and 0.05 ppm of malachite green.
(f) Treatments may be repeated as often as every 6-12 hours (depending upon the severity of the particular disease and the tolerance of the diseased fishes). Treatment should be repeated no less than every 24 hours (see step c) and continued for at least 3 days beyond the disappearance of all signs of disease. The main problem is in knowing when all white spots are gone from inside the mouth, gills, and nostrils of the fish. Typical treatments for Ich will depend upon the species of Ich involved, and may require six to 35 days or more in daily treatments. This means that daily partial water changes will need to be made followed by daily re-dosing of Rid-Ich+ until the infection is entirely gone. There are a number of "Ich" white spot species that can be involved, each with a different length of time of its life cycle in the white spot stage. In general these different species have different white spot stages varying from about 3 days as dormant white spots, to one week, to two weeks, to three weeks, and to 32-35 days or more. It takes an expert with microscopic examination to determine which species is involved. They all look alike. During the white spot stage the Ich are not treatable by any known treatment. Only when the Ich are hatched from the white spots and free swimming are they able to be killed by a treatment. The actual time necessary will depend upon the particular infection, the degree to which the fish are affected, how early the disease is detected, and when appropriate treatment is started. Note: Failure to properly diagnose a given disease and failure to start appropriate treatment early enough will often result in the death of some or all of the diseased fishes.
(g) After treatment, make a 40% water change. Add Kordon's NovAqua Plus® and AmQuel Plus® in the water, preferably before replacing water in the tank. Some situations may warrant the transfer of the affected fishes to a separate quarantine tank. If you elect to follow this procedure, the original aquarium or pond should remain devoid of any fishes for a period of not less than 4 days and preferably up to two weeks to insure that any remaining parasites have expired. Carefully inspect the fishes prior to returning them to the original aquarium or pond to insure that all signs of the infestation are gone. Keep in mind that the Ich white spot disease prefers to infect out of sight in the mouth, gills, and nostrils of the fish.