Question:
Are reverse osmosis water filtering system for the whole house worth the costs? I saw one for 5000.00?

Is this a good investment? are there more cheaper systems?

Answer: Most definately not. RO water is great for drinking because all the impurities have been removed. Do you realy need this pure of water to bathe in, wash clothes, flush toilets, etc? An activated carbon water filter to remove chlorine if you are on a public system. a solids filter is not necessary unless it is a domestic well. Why not soften your water, and install an undersink RO for consumption only? All for less than $2000?