I am a simple fish hobbyist- and was ecstatic to find this stabilized my aquarium Ph-I simply want to share my find with others.!!
Crushed coral in
CONVENIENT MESH BAG-
FIX LOW PH BALANCE IN YOUR TANK!.  You will see the Ph rise over the next couple of days.  Be sure to test your aquarium water with the appropriate test kit.
You will receive 12oz of crushed coral along with a MESH BAG to be  conveniently placed in your filter.
Please be sure to rinse the crushed coral in a cup of tank water before the coral is placed in the aquarium. Never rinse with tap water.  Mesh bag containing the crushed coral will be in a 5×7 black mesh bag
GREATEST FIX FOR OLD FRESH WATER TANK LOW PH IN YOUR TANK.  Item will be shipped in bubble wrap envelope.
HOW LONG DOES IT LAST?? -crushed coral is crushed shells, until they disintegrate the Ph will continue to stabilize.  Shells take years to disintegrate.  (decades?? I honestly don’t know).
I placed the 4oz crushed coral in my 29 gallon aquarium 3+years ago- the ph went to 7.0 & never dropped!
If you would like to purchase smaller amounts see my other listing.
Item will be shipped in first class bubble wrap envelope or if multiple items ordered a priority box may be used.