Description
Aqua-Pics pH Down 800g — Bulk pH reducer for a fish room or several large displays
A fish room with half a dozen tanks on the same bore or mains supply burns through a small reducer pack within weeks, and buying it by the hundred grams becomes its own chore. Aqua-Pics pH Down 800g (SKU: 724799) is the 800 g pack of Aqua-Pics’ granular freshwater pH reducer, using sodium biphosphate to bring alkaline water down toward a soft-water target. Aqua-Pics states the formula will not add to algae growth, unlike some phosphate-heavy alternatives. At 800 g it is a bulk size meant for several tanks, a breeding setup or a single large display with a persistently high pH.
Dosing follows the same pattern as the smaller packs: Aqua-Pics gives no single gram-per-litre figure, instead directing small, incremental doses and warning against overdosing, since a sharp pH swing stresses fish more than a stable but elevated reading. Because reducing pH strips away carbonate buffering capacity, Aqua-Pics recommends its KH Buffer once each tank reaches its target, to hold the new level through subsequent water changes. The 800 g pack is intended for keepers running several soft-water set-ups at once, discus, tetras, angelfish, apistogramma and other acid-water species, where dosing one tank at a time from a single large pack is more practical than juggling several small ones.
Usage & Application
When to Use
- Multiple established tanks: A fish room or several displays sharing the same hard water supply.
- Breeding set-ups: Soft, slightly acidic water favoured by species that spawn more readily under those conditions.
- Persistently high pH: Water that keeps testing high after most changes, needing regular correction.
- Buying in bulk: Avoiding repeat purchases of smaller packs for ongoing use.
Dosing & Administration Guide
- Treat tanks individually: Dose and test each aquarium on its own, not as a batch.
- Small increments: Add a little at a time rather than measuring for the whole pack at once.
- Retest before repeating: Confirm the pH has settled before dosing again.
- Pair with KH Buffer: Once at target, switch to the buffer to hold the reading.
Product Specifications & Highlights
Key Features
- Sodium biphosphate active: The compound responsible for lowering pH.
- Low algae impact: Aqua-Pics’ stated advantage over some phosphate-based reducers.
- Gradual-dose design: Intended for repeated small additions, not one large dose.
- KH Buffer pairing: Recommended companion for holding pH once adjusted.
- 800 g bulk pack: Sized for several tanks or a fish room rather than one aquarium.
Product Details
- Brand: Aqua-Pics (Australia)
- SKU: 724799
- Barcode (GTIN/EAN): 9336264001042
- Product Type: Additives & Supplements > Freshwater pH Down (Reducer)
- Net Weight: 800 g
- Active Ingredient: Sodium biphosphate
- Dose Rate: No fixed rate; add in small amounts as required and avoid overdosing
- Companion Product: Aqua-Pics KH Buffer, to stabilise pH after adjustment
- Other Sizes: 100 g (SKU 124755), 200 g (SKU 124756), 400 g (SKU 124757), 2 kg (SKU 724800)
- Target Environment: Freshwater aquariums


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