Disposable apparatus and kit for conducting dialysis

A disposable apparatus for a blood purification system comprising:

• a rigid plastic substrate, wherein said rigid plastic substrate has an I shape comprising a top member, a bottom member, and a connecting member, wherein each of the top, bottom, and connecting members house at least one flow path therein and wherein the top member comprises a first external port and the bottom member comprises a second external port that opposes the first external port;
• and
• a flexible tube having a first end and a second end, wherein said flexible tube is external to the rigid plastic substrate, wherein said first end of the tube is attached to the first external port on the top member, wherein said second end of the tube is attached to the second external port on the bottom member, and wherein said tube serves to connect a portion of the at least one flow path in said top member to a portion of the at least one flow path in said bottom member;
• and a dialyzer wherein said dialyzer is fluidically coupled to the rigid plastic substrate.