Ppm question for my nube self

I dont have a ppm or ec meter (yet) and i was wondering if theres any formulas for figuring it out or a chart sonewhere to follow to find my ppm. My water is RO water and my city has pretty good tap water so I imagine its gotta be under 50 ppm. Then i add
2 tsp of protekt for 5 gall
2 tsp sm 90 for 5 gall
1 tsp rapid start for 5 gall
8 ml hydroguard for 5 gall
alternate 3 tsp mollases for 5 gallon or tsp maxi grow for 5 gall with my every feeding nutes. Any ideas? Thanks
 
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