This process repeated over and over keeps everything at proper temperature. If air is introduced to the cooling system, it can get trapped and form a bubble in the liquid. This prevents the continual flow of liquid, and can create hot spots in the cooling system, depending on where the air is trapped.
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There are products which will control almost all broad-leaf weeds (and some grasses also) in bahia turf. The problem is that they are available only to 'professional' applicators. There are good reasons for this action. I will leave you two quotes from people who have made it their business to investigate these things.