Parts are dry??

[shiva]

Just so that you are aware, I do not think that "dumb" is the word that you were looking for. "Dumb" is an insulting word that means the same as "stupid." You may have meant "unclear." Just wanted to make sure that you didn't accidentally offend somebody.

I don't think the person is saying wrong, but many had problem regarding Irrigation systems as they work and don't work later.
My suggestion is why don't you install another system if you are not satisfied.