You want the water to flow through your regular filter pad
first to trap the larger particles before the water flows through the polishing
pad. This will keep your pad lasting longer before it needs to be cleaned or
replaced.
One pad thick should keep your aquarium water crystal clear.
With our aquarium service company we have never found it necessary to use more
than one of our dual density pads. We try to rinse the pad every week or every
other week depending on how heavy the livestock load is in the aquarium.
When you remove socks for cleaning, ensure they are empty by
shaking them out into a bucket. Since our method uses a washing machine, it is
more efficient to collect several sets of dirty socks from previous
changes.
Optional - run your washer in a hot rinse cycle to remove all soap residue
(normally only necessary in older machines).
Wash socks in hot water with 3 capfuls (teaspoons) straight bleach (Sodium
hypochlorite with no additives). Add an extra rinse cycle. DO NOT Use
Detergent.
Place socks in a clean, chemical-free environment to dry for at least 48 hours.
Should you need socks sooner - place them in a bucket with 2 gallons of water
with 1/5 teaspoon of Seachem Prime or similar chlorine remover for 30 minutes. For
a more detailed description of how to clean our filter socks, please visit the
Resources tab on our website. https://www.aquaticexperts.com/blogs/faq-resources/64782659-how-to-clean-filter-socks-and-filter-bags-faq