Below are some of the most frequently asked questions about our products. Please review these questions and answers. If you have a question that is not covered here, please feel free to email us at support@warnermarine.com Q: My Calcium and Alkalinity are completely out of balance and at the wrong levels, what do I do? A: The first step is to test your water to determine your current Calcium and Alkalinity levels. To correct Calcium add ReefPure Concentrated Calcium Supplement 3-5 times per week at the dosage listed on the bottle. Test weekly and continue until Calcium levels are 400-450ppm. For Alkalinity add ReefPure Marine pH Buffer or KH Buffer 3-5 times per week until the Alkalinity is 3.0-5.0 meq/l or 8.4-14dKH. Q: What is the white cloud that appears when I add CalxMax Part "B" to my aquarium? A: CalxMax Part "B" is the high pH Alkalinity part of the CalxMax 2 Part Calcium and Alkalinity System. Upon contact with saltwater a small amount of Magnesium and Calcium will temporarily precipitate causing a white cloud in the water. This is harmless and will clear again rapidly. To lessen this effect, add CalxMax Part "B" into the sump or anywhere with strong water flow and add CalxMax Part "A" into a different area of the aquarium several minutes later. Q: My CalxMax 2 Part Calcium/Alkalinity Buffer came nearly empty with a solid block of chemical in the bottom of the jug with only a little liquid. Is it OK to use? A: CalxMax 2 Part Calcium/Alkalinity Buffer in the 2 x 1 Gallon and 2 x 5 Gallon sizes is shipped as a concentrate. The end user must add purified fresh water to the jug to the top and mix well to prepare the solution for use. The Part "A" will mix rapidly but the Part "B" may take overnight to dissolve completely as it is quite concentrated. Q: Should I rinse my PHOSaR Iron based Phosphate Remover? A: Although the dust from PHOSaR is harmless, we reccommend rinsing ONLY with purified fresh water or aquarium water. Rinse the media several times until the water runs clear. One method is to place some PHOSaR in a bowl and rinse the media by filling and decanting the bowl repeatedly until the water runs clear. Q: How much PHOSaR should I use? A: PHOSaR treats approximately 1 Gallon per Gram of media. It is always best to make water quality improvements slowly and gradually over a period of time. Try using PHOSaR at 1/2 normal dosage for 2 weeks and then replace media lower Phosphate levels slowly. Q: Which Kalkwasser should I use for my aquarium, ReefPure Kalkwasser PLUS or ReefPure Kalkwasser? A: Both Kalkwasser and Kalkwasser PLUS are Ultra high quality products with subtle differences. Kalkwasser PLUS is a Calcium Oxide and produces heat when mixed with water so should not be used in an acrylic Kalkwasser reactor but works very well in a drip or dosing system after it has cooled. Kalkwasser PLUS is also less dusty, more dense and easier to work with. Kalkwasser is a Calcium Hydroxide and is easily used in acrylic Kalkwasser reactors or a drip or dosing system. Q: How is CalxMax 2 part Calcium/Alkalinity Buffer different than "do it yourself" two part solutions? A: CalxMax 2 Pt. Calcium/Alkalinity Buffer is clearly superior to the "DIY" two part solutions. 1) The quality of the raw materials in the "DIY formula" is questionable. CalxMax 2 Pt.    Calcium/Alkalinity Buffer is made with the finest raw materials. 2) "DIY formula" two part solutions contain NO essential Trace Elements. CalxMax    contains all important Trace Elements including Magnesium, Strontium and Iodide. 3) CalxMax 2 Pt Calcium/Alkalinity is a superior formulation with better pH stability and    more consistent Alkalinity. 4) Proven results. CalxMax has been proven by more than 10 years of use around the    world in the world's greatest reef aquariums. Q: My Calcium level is low but my Alkalinity is OK. I keep adding CalxMax 2 Pt. Calcium/Alkalinity Buffer but my Calcium just won't go up. A: It is crucial to bring your Calcium and Alkalinity to "balanced" levels before using CalxMax 2 Pt. Calcium/Alkalinity Buffer. If the Calcium is low, add ReefPure Concentrated Calcium to raise the Calcium independently of the Alkalinity. Once the Calcium and Alkalinity are "balanced", dose the aquarium as directed. Optimum levels are 450ppm Calcium and 4.0 meq/l Alkalinity. If the levels are "balanced" but low, like 350ppm Calcium and 3.2 meq/l Alkalinity you should dose CalxMax as directed. But levels must be "balanced" FIRST before dosing with CalxMax 2 Pt. Calcium/Alkalinity Buffer. Calcium can be raised independently with ReefPure Concentrated Calcium and Alkalinity can be raised independently with ReefPure KH Buffer. Q: What's the difference between PHOSaR and the new PHOSaR HC? A: PHOSaR HC is a new unique Phosphate Removing media that offers several advantages over competing products. PHOSaR HC is dense, durable and has a very high capacity for Phosphates, Arsenic and Silicates. PHOSaR HC is a granulated media that works BEST in a reactor or canister. PHOSaR HC has been tested to last in excess of 10 weeks in an aquarium with <.10ppm Phosphates. Since PHOSaR HC is nearly 2X more dense than competing media it is only neccessary to use about 1/2 the volume of other medias. A reactor that normally treats 200 gallons with a competing media will now treat 400 gallons with the same volume of media.