Check the listing for details. KORDON #35316 pH Increase Adjuster for Aquarium, 16-Ounce. Condition: New. Listed at 11.09 USD. KORDON #35316 pH Increase Adjuster for Aquarium, 16-Ounce PRODUCT DETAILS: You will want to understand the specific pH requirements of the fish you want to keep. Some fish (and other aquarium inhabitants) are hardier, while others can be quite sensitive to the water in which they live. Prepare your new water prior to water changes and allow it to reach room temperature. Raises pH to desired number in fresh or saltwater. pH Increase to bring water pH up into a more alkaline range. Rapid, large changes in either acidity or alkalinity of the water pH can be very harmful or fatal to the fish. Changes in pH reading of .2 or greater within a 24-hour period will induce physical stress. All changes need to be made slowly over a period of time. You should monitor your aquarium water using an accurate pH test kit. Features: PH factors in aquarium water can fluctuate Fish and other inhabitants of an single aquarium should require the same pH range You should monitor our aquarium water using an accurate pH test kit Country of Origin: UNITED STATES PAYMENT SHIPPING RETURNS We only accept payment through PayPal. This is to ensure that all of our buyers qualify for eBay Buyer Protection. Most orders are shipped within 1-2 business days with standard shipping and tracking. A tracking number will be posted as soon as the item has shipped. Please make sure to provide the correct shipping address during checkout as the address cannot be changed afterwards. We are not responsible for any incorrect or undeliverable addresses. We do not ship to PO/APO Boxes. We offer easy returns on most items within 30 days of delivery for a full refund.