10 tsp is alot of product for 5 gal of liquid. I use about 1/4 tsp per gallon of epsom salt…been using the same 8lb bag for like 3 years now and I bet I have anoher few years left on the bag. How much that quart of liquid stuff cuz I paid like 4 bucks for this bag of salt.
You are better off using dry minerals because they last longer and are normally a lot cheaper.
Dry Epsom salts need to be dissolved in hot tap water because they don’t normally dissolve in cold water.
I use 1/4 level teaspoon of dry Epsom salts and the same amount of dry calcium chloride in a 9 litre (bit over 2 gallon) watering can and use that every time I water. I use coconut coir and perlite for the growing medium and don’t see any calcium or magnesium deficiencies at that rate.