Dilute food grade h2O2 to 3% using permeate. Fill lines, but do not leave in all summer. The oxygen released will make your fittings very brittle of exposed for extremely long periods of time. I tend to leave mine full for about 1 day and then drain and coil them up.

Also note that shurflo diaphragms aren't rec9mmended to be exposed to H2O2. I use an aquatec to fill and pull dry.