If you see an increase in the filter back-pressure after adding Energizer Tablets it shows the pH of the pool water was not adjusted to the target of 7.2 before adding the product. You can make this adjustment after adding the Energizer Tablets simply by adding the amount of pH Decreaser you would have normally added before adding Energizer Tablets. If you don't know how much, try adding 1 pint muriatic acid (or 1 lb dry acid, sodium bisulfate) for every 5,000 gallons of pool water. Remember to pre-dissolve or pre-dilute the acid and walk it around the pool as you add it.
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