I would'nt go the direct RO/DI conect either it has other problems other then stated already such as the membraine leaching which is not to critical when making large quantities each cycle but to stop start a unit all day every day is well just bad,
Also agreed that a large brute can or the like will make you very happy when you dont have to make up sml 5gl buckets all day sundays
Be carfull I did this and brought a cheapO storage bin. I was out of town for 8weeks and had me misses look after the refilling of the bin , long story short I came back to a half dead SPS tank and could not find any problems until I decided to remove the Bin from service ( last thing I changed in tank) and at the bottom of the bin it was like milk.
The Bin had leached, hell knows what I put into the tank.