Water Purification Tablets

[LAC]

UPDATE ON LAST POST

I bought the Big Berkey just after my last post and have been using it extensively to purify bore hole water and so far I've not got sick (touch wood). The water source keeps getting connected and reconnected which leads to high levels of sediment arising for a week or two after reconnection - I removed and cleaned the filters after the first 6 weeks (and every 6 weeks thereafter) and the lower parts were caked in sediment so it's obviously doing it's job well, then cleaned it with the scotch bright pad as advised.

It is indeed an excellent water filter/purifier, but my only gripe is the quite poor quality plastic wing nuts supplied which secure the base of the black water filters to the bottom of the upper metal water chamber - I've had a few slip and the thread has been damaged to the point where it can no longer provide a tight enough seal. Yes I bought spare ones but it concerns me that one of them may break while in use and compromise the seal, and some of the water could then seep through unfiltered. I had an idea to buy some stainless steal wing nuts to replace these but the size of the screw on the base of the black water filter seems a bit odd - I measured it and it seemed it could be 10mm or 3/8 inch - as the Berkey is American made I assumed 3/8 inch but these were too small. I tried 10mm also too small. Anyone else had problems with the plastic wing nuts and were able to determine what size stainless steal replacements would fit the filters?

LAC