Dr. Dryden's Activate Fine Filter Media, Grade 1, A999008

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Maytronics A999008 Dr. Dryden's Activate Glass Filter Media

Activate is a permanent filter media that replaces sand, zeolite or crushed glass. It is a sustainable solution for crystal clear water used in more than 250,000 pools. It is trusted by industry professionals as the best product for creating clear water and a healthier swimming environment.

Activate is certified by WQA to meet NSF 50 – the industry standard for safe and clean water.

Product Details

  • Ultrafine filtration for CLEARER water
  • Created 300 times more surface area for superior filtration down to 4-5 microns.
  • Negatively charged filter media for CLEANER water
  • Attracts and captures harmful bacteria like a magnet.
  • Self-sterilizing surface for HEALTHIER water
  • Prevents the growth of bacteria and algae by inhibiting reproduction.



Brand Maytronics
Item Dr. Dryden's Activate Glass Filter Media
Size 25 lb Bag
Type Grade 1, Fine



Dr. Dryden's Story

When sea mammals like dolphins, whales, or sea lions are kept in captivity, it is often in chlorinated water. Dr. Dryden worked with these mammals in like conditions for many years. He noticed they often die of lung infections at a young age.

He was able to prove that lung infections in mammals are due to harmful air they are breathing that is just above the surface of the water. This harmful air is called trichloramine, which is the primary cause of chlorine odor that we smell in swimming pools.

Dr. Dryden invented an activated filter media called Activate. Using Activate helped save the lives of dolphins and other mammals by drastically reducing the formation of harmful trichloramines in chlorinated syste


  • 5
    Great investment

    Posted by Mark M. from Madison, WI on Jul 13 2022

    I purchased this at beginning of season. Waited to write a review until I actually gave this product a chance to prove itself. Best decision I ever made! My pool has never been this clear for so long. Just keep PH where it needs to be and make sure water stays chlorinated. I have already been recouping my costs in using way less chemicals to keep pool clean and saving water by not vacuuming to waste. Plus way less time needed for upkeep. Tremendous product that really works!