HYDRO ONE CHLORINE TABLET – 70% DOSAGE CALCULATOR

Chlorine Dosage Calculator

Calculate the recommended number of whole Hydro One Chlorine Tablet – 70% tablets for your pool based on your pool water volume and your current and target free chlorine readings. This calculator is calibrated only for Hydro One Chlorine Tablet – 70%.

1 Pool & Chlorine Readings

2 Recommendation

Step 1: Pool Size & Free Chlorine Readings

Enter your pool's internal measurements in metres and your latest free chlorine test results.

Length (m)

Measurement in metres

Width (m)

Measurement in metres

Average Water Depth (m)

Average water depth

Total Volume

0.00 m³

Total Water Volume

0 litres

Current Free Chlorine (ppm)

Enter the reading from your digital pool testing kit.

Target Free Chlorine (ppm)

Typical operating targets are commonly in the region of 1–5 ppm — confirm your target with Hydro One Pool Support if unsure.

This calculator is calibrated only for Hydro One Chlorine Tablet – 70% (70% available chlorine, 20 g whole tablet). Do not apply this result to another chlorine product, tablet size or concentration. Test your free chlorine before dosing — do not dose from pool size alone.

Formula: Length × Width × Average Depth = m³

Recommended Dosage

Based on the use of Hydro One Chlorine Tablet – 70% purchased from Hydro One.

Recommended Hydro One Chlorine Tablet – 70%

0 whole tablet(s)

of Hydro One Chlorine Tablet – 70%

Pool Volume0.00 m³

Water Volume0 L

Current Free Chlorine—

Target Free Chlorine—

Required Increase—

Estimated Resulting Increase—

Application instructions

Use whole Hydro One Chlorine Tablet – 70% tablets only — never cut, crush, break, divide or pre-dissolve a tablet.
Place the tablet only in the pool skimmer. Do not place it directly on the pool surface.
Maintain normal pool circulation.
Re-test after 24 hours before adding another treatment, unless directed otherwise by Hydro One Pool Support.
Never mix Hydro One Chlorine Tablet – 70% with other chlorine products, acids, pH products, or organic chemicals.
Follow the product label and safety requirements at all times.

Key Information

Hydro One Chlorine Tablet – 70% contains 70% available chlorine in a 20 g whole tablet. This calculator is calibrated only for this product.
Whole tablets only. The recommendation is always a whole number of tablets — never a fraction. Estimated requirements below one tablet are shown as zero, with a monitoring instruction instead.
Skimmer placement only. Add tablets only in the pool skimmer. Never place a tablet directly on the pool surface.
Re-test after 24 hours. Allow the tablet to circulate before testing again and deciding on any further treatment.
Never mix chemicals. Do not combine Hydro One Chlorine Tablet – 70% with other chlorine products, acids, pH products, or organic chemicals.

Full disclaimer

This calculator estimates a theoretical Hydro One Chlorine Tablet – 70% dose from the pool volume and free chlorine readings you enter. It is not a substitute for on-site water testing or the product label. Actual chlorine demand varies with sunlight, bather load, contamination, water balance and circulation, and results should be treated as an estimate rather than a guarantee.

Test current free chlorine and pH before dosing. Use whole tablets only, placed in the pool skimmer. Never mix Hydro One Chlorine Tablet – 70% with other chlorine products, acids, pH products or organic chemicals. Re-test after circulation and adjust in smaller increments. Contact Hydro One Pool Support if the result is below one tablet, unusually high, or otherwise uncertain.