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Koi Medic Salinity Meter - Hanna Electronic pH/Temp Pen
Master Liquid Test Kit - LaMotte Combination Test Kits
LaMotte Compact Colorimeter - Individual Liquid Test Kits
Pond and Watergarden Thermometer

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- Maintaining Pond Water Quality -

Make sure you pond has salt in the water. Salt is essential for fish health. Koi and goldfish need salt to control their electrolyte balance. Salt also enhances the natural slime coating on Koi which  fights off fungus and disease. Salt in the water also kills most parasitic infestations.

Any type of pure salt will work as long as it is iodine free. Table salt has iodine. You can order evaporated sea salts and specialty aquatic salts online, or get it at specialty shops locally.

Salt concentrations are easily measured with a Salinity Meter. It is important to pre-dissolve salt prior to addition to the pond or tank to avoid salt burns of fish. As a reference 1,000 gallons of untreated water would need 10 lbs. of salt. Salt is typically maintained by Koi enthusiasts at a concentration of 0.18% (1.8 parts per thousand).  Use 1 lbs. per 100 gallons of pond water under normal conditions.  If the salt level rises above 0.2% you can do a partial water change and add fresh water to dilute the salt content.

Use 3 lbs. per 100 gallons when treating for disease. Only go up to 3lbs per 100 gallons in an isolation tank because a solution of .30 percent salt will kill your pond plants! Once the effective dose of salt has been reached, it should be measured and maintained until the disease has passed. Once the disease has been treated lower the salt level back to 0.18 by doing water changes. See Sick Fish Treatment

Hanna Electronic pH and Temperature Sensor
For Ponds and Water Gardens

Hanna Instruments is a world leader in innovative water testing equipment. These digital "pen" style meters are super easy to use, waterproof and accurate. pH/Temperature waterproof, floating tester. Proper pH is very important for healthy plants and fish. This meter gives fast, accurate readings of pH (0-14 ppm), simultaneous readout of pH and temp (both °C and °F). Battery level indicator and auto shutoff. Automatic temperature compensation. 
Hanna PDF Instructions and Maintenance Data

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