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For Kitchen/Bathroom sinks you can fill up the sink with hot water and let it go down once a month. The hot water helps break up some of the build-up in the line. As far as main sewer lines a yearly preventable maintenance rodding will help keep the roots from clogging the line and causing a back-up.
We recommend not putting anything down your branch/main lines. A lot of the products for root killer will never even touch the roots. Roots usually grow from the top of the pipe and the stuff you put down is only touching the bottom of the pipes.
There is really nothing you can do to stop roots from entering a sewer line besides getting a yearly maintenance rodding to help prevent them from clogging the line in the future.
Tankless water heaters are sold as a connivence only not as a savings. The pro's of them, you do get unlimited hot water instantly on demand providing they are sized/installed properly. The con's, they are very costly to purchase and install and do require semi-annual maintenance to keep it running in proper order.
Gerber toilets are the best flushing for the money.
Run plenty of water before/during/after. Feed them slowly.
The most common plumbing issue is people not using the garbage disposal properly. Another common issue is spigots freezing in the winter time to prevent this is by removing the garden hose in the winter time.
Installing a water softener in your home will help remove any hard water issues.
The most common way to solve it is by installing a higher output pump.
Installing a battery back-up will help you with any worry about flooding.