Blue Tubing Transformers while the CWL Series is

while the CWL Series is for those with no concern over water hardness

EWS Spectrum has a 37 gallon per minute (gpm) flow rate

: If you have a larger home or water concerns

Caution: This is a safeguard to pressure surges and water hammers only

Recyclable Unit Every EWS Unit is Handmade in the USA from USA-Made Parts 1-Year Manufacturer Warranty   Features of the EWS Heater Guard Suitable for Plumbing Line Sizes 1 1/4 - 1 1/2 Protects Your Water Heater from Scale Build-Up

Blue Tubing Transformers while the CWL Series isFREE Shipping! Blue 1 4 5'L. For all units filtered water. Compatible with ALL EWS under counter water filtration units, and reverse osmosis systems.