Look for a product or two that contains both beneficial bacteria AND also mycorrhyzal fungi species. Both of these work symbiotically with the plant to protect it and boost growth. Mycorrhyzae extend the capacity of the root system, and both the bacteria and the fungus also break down nutrients and feed them to the plant in exchange for this service. They also defend their host plant against pathogens once they are established, making it very difficult for the bad guys to get a foothold.
Keep in mind also that the use of beneficials means that you're not going to want to be using any products that kill bacteria and fungi, such as physan, hydrogen peroxide, etc. Otherwise you're just wasting money. Feeding the plants organic nutrients for the microbes to convert and feed the plant with also helps.
As far as getting the best bang for your buck here, invest in a bucket, an aquarium airpump and airstone(s) and Molasses (you're going to want unsulphered blackstrap molasses, pref organic) and look for a fulvic/humic supplement. (also a small aquarium heater if it gets cool in your house) - these are effectively a one-time investment (keeping in mind that you will have to replace the airstones periodically). I will brew up a "tea" a couple days in advance with these and my beneficials and any organic nutrients I want to feed to my plants. The beneficial bacteria will feed on the sugars in the molasses and the mycorrhyzae feed on the humates.
Save some of the unused tea in the bucket when you choose to feed your plants. Then add more water (unchlorinated), and then add more molasses and humates. Feeding the beneficials in the bucket increases the population and keeps them going, so you can effectively keep that one dose of beneficials multiplying and going indefinitely.
Check your local hydroponic store - they should have all of these items readily available.
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Dana
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