Sizing water softener
I've recently moved into a newly built home and the water here is pretty hard, and I'm looking to install a softener to solve this problem. I'm hoping I can get some guidance as to the proper size of water softener and if the softener I'm leaning towards sounds right for my application.
Water hardness is 18 gpg according to city water department. No iron. Hardness is high calcium and magnesium. Water has no odor, is clear, and has very little particulate. I've not done any tests, information has come from the water department.
Home has 3/4 inch pex coming off of the water meter and 3/4" or 1/2" pex feeding different parts of the house. 2 adults and 2 young children. Eventually will probably be 3 kids for a total of 5 people in the house. 4 bed 3 bath 3000sf located in PA. One large tub, no multi head showers. I'm planning on softening all interior water and leaving exterior hose bibs unsoftened. Softener would be located in the basement.
I'm leaning towards the fleck 5600sxt 48,000 grain water softener system that would include a 1.5 cubic foot 8% cross link resin, a 10x54 resin tank, and a 14x34 square salt tank. Ive read targeting a weekly regeneration is ideal, and would like to aim for that. Help me understand if this is a smart choice for me. Also, I know next to nothing about filtration. Based on this info, should I be looking at some sort of water filtration, and if so, what type? Please let me know if I have left out any critical information.