After a evening of home experimentation I have found that Seachem Neutral Regulator is most definitely not suited to alkaline tap water as found in Brisbane Australia. After much effort a realized only a very small amount of TechDen PH DOWN was required to turn a 10 L bucket of Brisbane water to pH 7.0. I have been (without testing) adding large amounts of the buffer in order for it to compensate for the Brisbane tap water. Such large amounts are expensive and unnecessary. I suggest that Seachem market a product that can deal with higher levels of alkalinity.
Seachem Neutral Regulator has effectively maintained water quality for many years in a turtle's indoor water enclosure. Seachem Neutral Regulator readily supports filtration and water change-over processes to facilitate a healthy living environment for this water-loving reptile.
The safe and easy, economical way to set your aquarium ph, no fiddling. Dissolve the dose in hot water, add cold and add to aquarium in recommended dose-that easy.