Which Ward test? W5A vs W6

[WI_Wino]

I'm looking to get my water tested and Ward's Labs has a couple of options, W5A and W6:

"W5A Brewer's Test" - $42 kit/$27.35 test only
Sodium, Calcium, Magnesium, Potassium, Carbonate, Bicarbonate, Chloride, Iron, Sulfate, Nitrate, Electrical Conductivity, Est.Total Dissolved Solids, pH, Total Hardness (Lime), Total Alkalinity & Total Phosphorus

"W6 Household Mineral Test" - $33.35 kit/$21 test only
Sodium, Calcium, Magnesium, Potassium, Carbonate, Bicarbonate, Chloride, Sulfate, Nitrate, Electrical Conductivity, Est. Total Dissolved Solids, pH, Total Hardness (Lime) & Total Alkalinity

I haven't found a definitive answer online about which one I actually need. The only difference is the W6 does not include total phosphorus. Do I care about phosphorus? I'm on a rural, private well.

 

[mabrungard]

Nope, you don't care about phosphorus. Get the W6 test and buy yourself a beer with the savings.

 

[WI_Wino]

Perfect, just what I was expecting/hoping to hear. Thanks!