Discount Pool Chemicals for Inground & Above Ground Swimming Pools

Keep your pool water balanced, clear, and algae-free with discount pool chemicals for inground and above-ground pools. PST Pool Supplies offers specially priced pool chemical products from Matrix Swimming Pool Solutions, Pool Season, Natural Chemistry, and Solaxx — covering phosphate removers, water clarifiers, flocculants, and specialty algaecides, all starting from under $20.

Phosphate removers are the standout category in this collection. Phosphates enter pool water from fertilizer runoff, leaves, swimmer waste, and municipal tap water — and serve as the primary nutrient source for algae. Eliminating phosphates starves algae before it can bloom, reducing the chlorine demand and keeping water clearer between treatments. Matrix Black Label Phosphate Remover (available in 64 oz measurable and 1-gallon sizes) is a highly concentrated formula for pools with elevated phosphate readings. The Matrix Phos Eliminator Concentrate and Pool Season Phosphate Control offer more targeted options for regular maintenance dosing. Pool Season Super Water Clarifier coagulates fine suspended particles into larger clusters that the filter can capture, restoring water clarity after algae treatments or following heavy rain. Pool Season Liquid Floc Plus causes suspended particles to sink to the pool floor for manual vacuuming — ideal for rapid water clearing after severe clouding events. Yellow Out (4 lb) is a specialty treatment for yellow/mustard algae, one of the most difficult pool algae strains to eliminate. For a full range of pool sanitizers, balancers, and specialty chemicals, browse our complete pool chemicals collection. Water chemistry guidance is available from the National Swimming Pool Foundation.

Phosphate testing and control is becoming an increasingly important part of pool maintenance, particularly in pools near landscaped areas or in regions where tap water contains elevated phosphate levels. The Pool Season and Matrix phosphate removers in this collection are lanthanum-based — they bind to phosphates to form an insoluble compound that your filter traps and removes. Always test pool chemistry (pH, alkalinity, chlorine) before adding any specialty chemical, and ensure the filter is clean and operating normally for maximum effectiveness. Phosphate removers temporarily cloud pool water during treatment — run the filter continuously and backwash or clean the filter after treatment to remove the captured phosphate compounds.

Shop discount pool chemicals and maintain cleaner, clearer water with targeted specialty treatments at reduced prices.