Please recommend which model number is the best to fit a family of 3-4 people for cooking and drinking water. What is the Ph value for the normal people to use. What is your lead time to ship out the product after you receive an order? Is the filer easy to install?I'll recommend one of our most versatile and sought after undersink filters. It is the dual cartridge system located here: ;http://doultonusa.com/HTML%20pages/ip200UC_plus.htm. Our filters will not adjust or effect the pH of your water. Typical city water is around 7.5 pH and our filters will not mess with that.
Lead-time is 2-5 business days after order is placed and will depend on your location. The filters come with a DIY installation kit for any handy person to install. http://doultonusa.com/doulton_water_filters/Undersink-installation-instructions.pdf.