Boyd’s Chemi-Pure 10 Oz.

Chemi-pure can be used with all water types as a chemical absorption
filter and ion generator and exchange unit to positively keep pH at a
perfect constant level. Also fantastic for use with African Cichlids
and Discus! Needs replacement only every six months under normal
circumstances. Use 1 unit up to 40 gallons, 2 units from 40 to 100
gallons, above 100 gallons add one unit for every 25 gals. 10oz.
Soft corals – Crustose Coralline Algaes – Caulerpas – Gorgonias –
Seafans – other invertebrates and fish of all species thrive and grow
luxuriously with no water change necessary using real seawater or the
better imported mixes. This is not a claim, but fact, experienced by
thousands of CHEMI-PURE users. In fact, salt water fish have spawned
repeatedly in 5 year old water. CHEMI-PURE does not remove trace
elements and is the only filter medium which aids in the natural
balance of positive and negative charges, with an emphasis on the
beneficial negative ion. CHEMI-PURE comes packed in pure polyester
filter bags in sealed plastic bottles, called 1 unit, one of which is
recommended for up to 40 gallons of water, and which is completely
active for 4-6 months with no `regeneration` or cleaning required and
is cheaper than carbon or pads. The one filtration product we
unreservedly recommend for use with CHEMI-PURE is the Poly-Filter, by
Poly-Bio Marine! Use one pad above and one below the CHEMI-PURE bag. We
also recommend the use of foam fractionation or “protein skimmers.”