Lathe coolant additive

Brad, you don't need additives. Main issue is when a film of tramp oil or separated soluble oil settles on the surface and excludes air, so the anaerobic bacteria can breed. Either fit a skimmer (I use the belt style) or aerate the tank with a fish tank bubbler.

Andrew

Yep. I don't think there are any additives which actually work, have tried a fair number

Fish tank bubbler on a timer is probably best. Shouldn't cost more than

hour a day).

-- Peter F

runs for a hour a day and seems to be fine. It is about time I changed the coolant though as I think I had allowed it to dry out as it isn't used frequently and it may have congealed in the tank as it's now rather weak having topped up the water lost due to evaporation.

Many thanks everyone who replied, I love simple solutions and I'll get a fish tank pump a.s.a.p. Brad

runs for a hour a day and seems to be fine. It is about time I changed the coolant though as I think I had allowed it to dry out as it isn't used frequently and it may have congealed in the tank as it's now rather weak having topped up the water lost due to evaporation.