We purchased this whole house filter unit along with alkaline cartridges to balance the PH, as our water was highly acidic. Our previous well water testing results showed Acetone, Coal, DDT, and other herbicides, as well as Nuclear Radiation. We retested our water after 2 months with these filters, the results were 100% pure water, no contaminants. Thank you to Igor for his great expertise and customer service. We highly recommend PureEffect and this product.