Big Bloom is a micro nutrient, not very strong and not very useful just by itself.
Most the manufacturers of nutrients for growing marijuana publish feeding schedules for their products to help users get the best results.
This is the Fox Farms Feeding Schedule for growing in soil. They have other charts for other growing mediums.
The Fox Farm trio that many refer to are the nutrients in the green section of the chart. Big Bloom, Grow Big and Tiger Bloom are the products. As you can see, the ratios of these products very almost weekly. You mix them into your water, adjust the pH to the suggested range (6.3 to 6.8) and feed your plants.
The Solubles are powders that get mixed in during the flowering stages to boost the bud development. They are the products in the purple section of the chart. Open Sesame, Beastie Bloomz and Cha Ching. These are mixed in with the products in the green section of the chart that you mixed previously. If you use these products you don’t adjust pH until all the products are mixed together.
At this point, if the water you started with had a low ppm (low ratio of solids) then all the above products mixed together should fall in the range listed at the top of the chart in the dark blue section. EC and PPM are two ways of measuring the same thing and most pens will display either one. If you are just starting out, the EC and PPM can be ignored for your first couple grows and you can just follow the chart, but once you learn what to expect following these values can help you fine tune your grow.
The products in the orange section of the chart are special items such as a foliar spray, three products with bacteria to feed the roots, two organic fertilizers, and a bloom flavor booster.
The Fox Farms Dirty Dozen I mentioned a few posts above includes all the products on the following feed schedule except for Wholly Mackerel and Kelp Me Kelp You, the two organic fertilizers. The Dirty Dozen also includes Sledgehammer, the product used for flushing in the light blue vertical bars.
Hope this helps