Overview

Maintain calcium and alkalinity with a single, time-tested method. Isol8:Ca(OH)₂ Kalkwasser is ultra-pure calcium hydroxide for preparing saturated limewater that gently raises Ca and dKH as it replaces evaporated water—often improving pH and overall stability in SPS/LPS and mixed reefs. Formulated for the Captiv8 BluePrint methodology and dosing via ATO, kalk stirrers/reactors, or manual drip.

Key Features

• Two benefits, one solution — Adds calcium and alkalinity in balanced proportion by dosing limewater.

• Natural pH support — Consumes ambient CO₂ and typically elevates pH toward the optimal reef range.

• High-purity powder — Dissolves cleanly to make clear, saturated kalkwasser (no perfumes, dyes, or fillers).

• Flexible delivery — ATO reservoir, peristaltic drip, or kalk stirrer/reactor compatible.

• Methodology-ready — Integrates with BluePrint scheduling; pairs cleanly with 2-part/trace programs when demand outpaces kalk alone.

Directions (Preparing Limewater)

1. Mix: Add ~2 tsp per US gallon (≈8 g per 3.8 L) of RO/DI to make saturated kalkwasser. Stir briefly.

2. Settle: Allow undissolved fines to settle; dose only the clear solution.

3. Dose slowly: Add in a high-flow sump area, ideally via ATO or a controlled drip to match evaporation.

4. pH watch: Keep display pH ≤ 8.5. If pH rises quickly, reduce rate or strength.

5. Maintenance: Top off the reservoir with RO/DI and add more powder as needed; discard heavy sediment periodically.

Do not add dry powder directly to the aquarium. Always handle as a caustic chemical; wear eye/skin protection.

Best Practices

• Target core stability: Alk 7.5–9 dKH, Ca 420–450 ppm, Mg 1280–1380 ppm, Salinity 1.025–1.026, Temp 77–79°F.

• Keep the reservoir sealed to limit CO₂ ingress (which weakens kalkwasser).

• Dose primarily at night if you need extra pH support.

• If kalk cannot meet demand alone, supplement with Isol8:Ca (calcium) and an alkalinity component; keep additions separate and spaced.

• For kalk stirrers/reactors, maintain a thin layer of powder at the bottom; avoid constant heavy slurry dosing.

Compatibility

• Works alongside protein skimmers, carbon, PO₄ media, refugia, and UV (dose in sump, not via UV chamber).

• Safe with amino/trace programs (dose at different times).

• Avoid concurrent dosing into the same location with alkalinity 2-part to minimize precipitation.

Product Specifications

• Product: Captiv8 Reef BluePrint Isol8:Ca(OH)₂ Kalkwasser

• Chemical: Calcium hydroxide powder (food/reef grade)

• Function: Balanced addition of Ca and alkalinity via saturated limewater; pH support

• Delivery Methods: ATO reservoir, peristaltic drip, kalk stirrer/reactor

• Sizes: 1.0 kg, 2.5 kg, 5 kg

• Storage/Safety: Store dry, airtight, and away from CO₂-rich air; caustic—use gloves/eye protection; keep from children & pets.