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Problem: I want to keep my current schedule of watering my seedlings every 2 hours during the day but not at night. I currently just set the rain delay to 12 hours every night but i'm not going to be home for 4 days. I don't want to water through the night and don't want to stop watering as its going to be a hot weekend.
Solution: Use my timer from the front sprinkler-system-in-a-box (Don't need to water the front while i'm gone) and connect it in series with my back yard timer. The idea is that the first timer opens a valve for 12 hours during the day while the second one waters every 2 hours.
Another problem: my cheap timers will only stay open for a max of 6 hours and only start once per day for each zone.
Another Solution:

I used 2 zones and some creatively sourced hoses and Y... may or may not be taken from our washer and dryer. Anyways it looks like a mess of hoses but it gets the job done for all of us without inground sprinklers.
Solution: Use my timer from the front sprinkler-system-in-a-box (Don't need to water the front while i'm gone) and connect it in series with my back yard timer. The idea is that the first timer opens a valve for 12 hours during the day while the second one waters every 2 hours.
Another problem: my cheap timers will only stay open for a max of 6 hours and only start once per day for each zone.
Another Solution:

I used 2 zones and some creatively sourced hoses and Y... may or may not be taken from our washer and dryer. Anyways it looks like a mess of hoses but it gets the job done for all of us without inground sprinklers.