Using TSP to clean cartridge filter

[dmattle]

I see everywhere to use 1 cup per 5 gallons of TSP. So if using dry TSP, how many ounces are in 1 cup? I know 8 oz fluid =1 cup? Or am i over thinking it and just fill a cup's worth of dry TSP per 5 gallons?

 

[1poolman1]

I see everywhere to use 1 cup per 5 gallons of TSP. So if using dry TSP, how many ounces are in 1 cup? I know 8 oz fluid =1 cup? Or am i over thinking it and just fill a cup's worth of dry TSP per 5 gallons?

Yes. Definition:
The cup is a cooking measure of volume, commonly associated with cooking and serving sizes. In the US, it is traditionally equal to one-half US pint (236.6 ml).