And is available to answer any questions during the life of the product. Note:-To ensure the system gets adequately flushed before use, please follow the Manual or the Video on amazon page to flush the system 3-5 TIMES if you are commissioning the system for the first time. The PH of purified water after filtration depends on the PH of your tap water. If the PH of your tap water is less than or equal to 7, then the filtered purified water is weakly acidic; If the PH of the tap water is greater than 7, then the filtered purified water may be weakly acidic or weakly alkaline.(It depends on the alkaline ion content of your tap water). Only One CF Filter: One CF Filter. Only One RO Filter:One RO Filter. 2 CF Filter &1 Ro Filter:Two CF Filter and One RO Filter. 4 CF Filter &2 Ro Filter:Four CF Filter and Two RO Filter. 6 CF Filter &3 Ro Filter:Six CF Filter and Three RO Filter. Y7 RO Replacement Cartridge(100GPD). Y7 2CF 1RO Replacement Cartridge. Y7 4CF 2RO Replacement Cartridge. Y7 6CF 3RO Replacement Cartridge. (Sediment PP Membrane & Pre-Carbon Block). 0.0001 Micron RO Membrane. This item is in the category "Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters". The seller is "excellent-honor-sales" and is located in this country: US. This item can be shipped to United States, New Zealand, Fiji, Papua New Guinea, Wallis and Futuna, Gambia, Malaysia, Taiwan, Poland, Oman, Suriname, United Arab Emirates, Kenya, Argentina, Guinea-Bissau, Armenia, Uzbekistan, Bhutan, Senegal, Togo, Ireland, Qatar, Burundi, Netherlands, Slovakia, Slovenia, Equatorial Guinea, Thailand, Sweden, Iceland, Macedonia, Belgium, Israel, Kuwait, Liechtenstein, Benin, Algeria, Italy, Swaziland, Tanzania, Pakistan, Burkina Faso, Singapore, Kyrgyzstan, Switzerland, Djibouti, Chile, China, Mali, Botswana, Republic of Croatia, Cambodia, Indonesia, Portugal, Malta, Tajikistan, Vietnam, Paraguay, Saint Helena, Cyprus, Seychelles, Rwanda, Bangladesh, Australia, Austria, Sri Lanka, Gabon Republic, Zimbabwe, Bulgaria, Czech Republic, Norway, Côte d'Ivoire (Ivory Coast), Kiribati, Turkmenistan, Greece, Yemen, Afghanistan, Montenegro, Mongolia, Nepal, Bahrain, United Kingdom, Bosnia and Herzegovina, Hungary, Angola, Western Samoa, France, Mozambique, Namibia, Peru, Denmark, Solomon Islands, Vatican City State, Sierra Leone, Nauru, Cameroon, Guyana, Azerbaijan Republic, Macau, Georgia, Tonga, San Marino, Eritrea, Morocco, Mauritania, Philippines, Democratic Republic of the Congo, Republic of the Congo, Colombia, Spain, Estonia, Zambia, South Korea, Vanuatu, Ecuador, Albania, Ethiopia, Monaco, Niger, Laos, Ghana, Cape Verde Islands, Moldova, Madagascar, Lebanon, Liberia, Bolivia, Maldives, Gibraltar, Hong Kong, Central African Republic, Lesotho, Nigeria, Mauritius, Jordan, Guinea, Chad, Andorra, Romania, India, Serbia, Kazakhstan, Saudi Arabia, Japan, Lithuania, Malawi, Finland, Tunisia, Luxembourg, Uganda, Brazil, Turkey, Germany, Egypt, Latvia, South Africa, Brunei Darussalam.