The number of people in a household can have a large impact on the appropriate softener needed. With the average family using approximately 80 to 100 gallons per person daily, it is easy to see that for some families, having ENOUGH soft water is very important. It is also important to factor in the FUTURE needs of a growing family.

Family Size	Up to 10 gpg Water Hardness	11 to 20 gpg Water Hardness	21 to 30 gpg Water Hardness	31+ gpg Water Hardness
1 to 2 People	MSD34C MSD30D MSD27B MSS20B	MSD34C MSD30D MSD27B MSS20B	MSD34C MSD30D MSD27B	MSD34C MSD30D MSD27B
3 to 4 People	MSD34C MSD30D MSD27B MSS20B	MSD34C MSD30D MSD27B MSS20B	MSD34C MSD30D	MSD34C MSD30D
5 to 7 People	MSD34C MSD30D MSD27B	MSD34C MSD30D	MSD34C MSD30D	MSD34C
8+ People	MSD34C MSD30D	MSD34C MSD30D	MSD34C	MSD34C

Iron in water causes stains on clothing and plumbing fixtures. It negatively affects the taste of food, drinking water, and other beverages. Iron in water is measured in parts per million (ppm). The total ppm of iron, and type or types, is determined by chemical analysis. Water may contain one or more of the four types of iron and any combination of these. Total iron is the sum of the contents.

The four different types of iron in water are:

Ferrous (clear water)
Is soluble and dissolves in water. It is usually detected by taking a sample of water in a clear bottle or glass. Immediately after taking, the sample is clear. As the water sample stands, it gradually clouds and turns slightly yellow or brown as air oxidizes the iron. This usually occurs in 15 to 30 minutes.

This unit WILL remove moderate amounts of this type of iron (see the softener performance specifications chart. When using the softener to remove Ferrous (clear water) iron, add 5 grains to the hardness setting for every 1 ppm of Ferrous (clear water) iron.