35% Spa Science Food Grade Hydrogen Peroxide. 4 Gallons Certified Food Grade Hydrogen Peroxide in an easy to handle jug.
4 oz 35% Spa Science per 100 gallons of hot tub water on average every 3-4 days. The test strips will indicate from 0ppm up to 400 ppm.
A 100ppm level will take 4oz per 100 gallons of water. So 400 gallons of water adding 16 oz of 35% Spa Science will on average will obtain a 100 ppm concentration level. It is ok and safe to exceed 100ppm if desired.
Now maintaining 100ppm level will depend on your source water, how often you use the tub, how many people and make up, skin lotions etc present on bathers before using the tub.
On average adding more every 3-4 days. Per month 112oz – 149oz. A gallon is 128oz for reference.
Maintain water hydrogen peroxide level at 100 ppm or greater.