We recently purchased a used 100 gal spray tank. We have fertilized for several years now but never liquid. I am looking to replace the hose that came with our unit and am seeking recommendations on what to get. I know what is on there now is 1/2". Also, I am looking to apply a liquid app. for weed control on my problem yards this fall. What would you suggest using? Is there a combination weed control/fertilizer that I could use for this? Thanks in advance for the advice.