Tbone
RS series are assmbeled from solid cast acrylic tube & sheet material which is glued together
CS series are assembeled from solid cast acrylic tube & PVC sheet material which is hot air welded together
Other than that ,they are same great design , same pump & performance.
CS models are being discontinued & will be replaced with the RS line
Also there is a RC line that is the recirculating design.
The new RS series will be widely available @ the stores with great pricing very soon ,I hope this helps, any questions do not hesitate to drop me a pm
Thanx
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